List Of All Extensions And Filetypes - C

This is an easy approach from me to give and describe each and every filetype and extension as much as possible.
here is the list for the information about various filetypes and extensions starting from alphabet C

Extension	Information
C	Check Point Site Configuration for Secure Remote (Check Point Software Technologies Ltd.)
C	UNIX Compact File Achive
C	Desktop Color Separation Specification Cyan Layer
C	C/C++ Program File
C	ADS Source Code (Autodesk, Inc.)
C	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
C	Origin C Program File (OriginLab Corporation)
C V	Cvip File
C!_	Audio Utility Midimach Compressed File
C#=	C# (Microsoft Corporation)
C++	C++ Source Code
C--	Sphinx C-- Source
C0	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
C00	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C00	Ventura Print File
C01	Genesis 2000 (Genesis 2000, Inc.)
C01	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C02	(C02-C38) Driveimage Ace File
C02	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C03	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C04	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C05	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C06	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C07	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C08	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C08	Lord Of Destruction Game File
C09	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C1	Pov-ray for Windows v3.1 Scenes Advanced Newltpot File (Persistence of Vision Raytracer Pty Ltd.)
C10	IRIG 106 Original Recording File (Range Commanders Council)
C10	WinAce Compressed File Split Portion of Compressed File (e-merge GmbH)
C13	Charlie Packer
C1S	Capture One Photo Cache File (Phase One)
C2	Pov-ray for Windows v3.1 Scenes Advanced Newltpot File (Persistence of Vision Raytracer Pty Ltd.)
C2C	CopyToDVD Project File (VSO-Software)
C2D	WinOnCD CD Image (Sonic Solutions)
C2E	NJStar Chinese Word Processor Dictionary File Index (NJStar Software Corp.)
C2I	Tt File
C2I	Driver File
C2L	Cequadrat WinonCD File
C2X	WinonCD File
C3	Pov-ray for Windows v3.1 Scenes Advanced Newltpot File (Persistence of Vision Raytracer Pty Ltd.)
C3	3D Model
C39	(C39-C56) Quicken Ace File
C3D	Coordinate 3D
C3D	Chem3D Chemical File (CambridgeSoft Corporation)
C3D	Micrografx
C3D	Cult3D Designer Intermediate File
C3E	Cype
C3T	Chem3D Chemical Template File
C4	Edmics
C4	Joint Engineering Data Management (JEDMICS) DoD Engineering Data Format
C4	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
C4D	Cinema 4D 3D Model (MAXON Computer GmbH)
C4D	Clonk Object Definition (RedWolf Design GmbH)
C4F	Clonk Round File (RedWolf Design GmbH)
C4G	Clonk System File (RedWolf Design GmbH)
C4P	Clonk Player File (RedWolf Design GmbH)
C4S	Clonk Scenario (RedWolf Design GmbH)
C4V	Clonk Video (RedWolf Design GmbH)
C6	Ashlar-Vellum (Ashlar Incorporated)
C64	Commodore 64 Game ROM
C86	Computer Innovation C86 C Program
C9	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CA	CLAN Conversion Analysis (Child Language Data Exchange System)
CA	Telnet Server Initial Cache Data File
CA	FlexPlus Data File (DATAIR Employee Benefit Systems, Inc.)
CA0	Installer Packed and Split File (Borland Software Corporation)
CA1	Delphi Install Disk11 File
CA1	STABCAL (stability calculation for aqueous systems) File
CA1	OzWin CompuServe E-mail/Forum Access Catalog File
CA2	Delphi Install Disk12 File
CA2	STABCAL (stability calculation for aqueous systems) File
CA3	Delphi Install Disk9 File
CA4	STABCAL (stability calculation for aqueous systems) File
CA4	Delphi Install Disk10 File
CA4	Electronics Workbench Circuit
CA5	Delphi Install Disk11 File
CA7	Beta 44 Job File
CA7	STABCAL (stability calculation for aqueous systems) File
CAB	Install Shield v5.x or 6.x Compressed File (InstallShield Software Corporation)
CAB	Cabinet File (Microsoft Corporation)
CAB	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAC	dBASE IV Executable File
CAC	Infoview (Microsoft Corporation)
CAC	Collage Alarm Clock Alarm File (Collage Alarm Clock)
CACHE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CACHE	Snacc-1.3 VDA File
CAD	QuickCAD CAD Drawing (Autodesk, Inc.)
CAD	Softdesk Drafix CAD File
CAD	EXTRACAD Drawing (Softwing Srl)
CAD	CadStd Drawing (CadStd Computer)
CAD	Inago Rage Compact Arena Definition (Dejobaan Games)
CADET	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAE	Abaqus/CAE CAE Model File (Dassault Systèmes)
CAE	Caditor Encrypted Document (Caglow)
CAF	Class Action Gradebook Secondary/College Edition Data File (CalEd Software)
CAF	GarageBand Apple Loop (Apple Inc.)
CAF	Southern Company Terrestrial Data Acq
CAG	CADfix ASCII Geometry File (ITI TranscenData)
CAG	Capella Gallery Data File (Capella Software)
CAG	Clip Gallery Catalog File (Microsoft Corporation)
CAI	SeeYou Flight Data (Naviter)
CAISSE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAJ	CAJViewer Full-text Database
CAK	Sega FILM/CPK File Format (Sega of America, Inc.)
CAKEWALKWINDOWLAYOUT	Cakewalk Window Layout (Cakewalk)
CAL	CyberAudioLibrary Link
CAL	HTML Calendar Maker Pro
CAL	QV Map Geographic Coordinates (Touratech)
CAL	PhotoSmart 850 Digital Camera Firmware Update (Hewlett-Packard Development Company, L.P.)
CAL	Cakewalk Application Language Script (Cakewalk)
CAL	Calendar File
CAL	Radiance Function File Format
CAL	Daqarta Extended Audio Data (Interstellar Research)
CAL	SuperCalc Worksheet
CAL	CALS Raster
CAL	Creatacard Calendar Project (Broderbund)
CAL	DOS Calendar Creator File
CAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAL	Schedule Data (Microsoft Corporation)
CALC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CALCULATOR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CALENDAR1994	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CALL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CALS	CALS Raster
CAM	Minolta Scanner 3D File (Minolta)
CAM	Casio QV Digital Camera Image (Casio Computer Co., Ltd.)
CAM	Camtasia Studio Project/Producer Files (TechSmith Corporation)
CAM	Calibrated Camera File Photomodeller
CAM	NASCAR Racing 2002 Replay Camera Settings (Sierra)
CAM	Mill Data File (GraphiTech Ltd.)
CAM	HouseCall AUTOEXEC.BAT Backup (Trend Micro Inc.)
CAM	Abe's Oddysee Background (Oddworld Inhabitants)
CAMP	Windows Color System Color Appearance Model Profile (CAMP) (Microsoft Corporation)
CAMPROJ	Camtasia Studio Project File (TechSmith Corporation)
CAMREC	Camtasia Studio Recorder File (TechSmith Corporation)
CAMS	Driver (Atari)
CAMSHR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAMTHTR	Camtasia Studio Theater File (TechSmith Corporation)
CAN	.Can Encryptor/Decryptor Encrypted File
CAN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAN	Canon Navigator Fax
CAP	Shomiti Surveyor Capture File
CAP	Snoop Capture File
CAP	Telix Session Capture
CAP	TTC FireBerd 500 PC Capture File
CAP	PacketView Pro Packet Trace Data (Klos Technologies, Inc.)
CAP	Agilent LAN Analyzer Capture File
CAP	Ventura Caption
CAP	WWG Domino Capture File
CAP	WWG LinkView PRO Capture File
CAP	ProComm/Telix session Capture File
CAP	Sniffer Capture File (Network Associates Technology, Inc.)
CAP	NetMon Capture File (Microsoft Corporation)
CAP	Fluke Protocol Inspector Capture File
CAP	Capella Music Sheet Data File (Capella Software)
CAP	Code Architect Project File (Embedded Systems Academy)
CAP	Generic Network Capture Document
CAPITAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAPROJ	ChartAble Project File (MRDC Ltd)
CAPS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAPS	Visimetrics Digital CCTV Recording
CAR	Viper Racing Car Description File
CAR	Design-Your-CD Data File (Avery)
CAR	SeeYou Airspace (Naviter)
CAR	Carnivores / Ice Age Resource File (Action Forms, Ltd.)
CAR	Railroad Tycoon 3 Car Properties (PopTop Software Inc.)
CAR	CAR Archive Compressed Archive (MylesHi! Software)
CAR	SAPCAR Archive (SAPGenie.COM)
CAR	NeoBook Cartoon (NeoSoft Corp.)
CAR	Cellsprings/Web or DT Rule File (J.M.G. Elliott)
CAR	CardMaker Ver. 1.0-2.0 Card File (Avery)
CAR	PSA Cards Address Book (PSA Software)
CAR	Creatacard Quarter-Fold Card Project (Broderbund)
CAR	AtHome Assistant
CAR	Carrara Environment (DAZ Productions)
CAR	Insight II Cartesian Coordinate File (Accelrys Software Inc.)
CAR	NASCAR Racing 2002 Car Description File (Sierra Entertainment, Inc.)
CARAMBA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CARD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CARD	Funkiball Adventure Auto-Saved Game File (RealNetworks Inc.)
CARDS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAROL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAROLES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAS	Comma-delimited ASCII File
CAS	Quest Compiled Adventure Game (Axe Software)
CAS	Atari Cassette Image File (Atari)
CAS	i2's Case Notebook Timeline Analysis
CAS	Cascade DTP Ver. 3 Layout File (Price Media)
CAS	FLUENT Case (Fluent Incorporated)
CAS	Videoton TVC Computer Tape File
CAS	Casio Calculator Program (Casio Computer Co., Ltd.)
CAS4	Cascade DTP Ver. 4 Layout File (Price Media)
CASCII	CACTVS Chemical ASCII Format
CASE	EnSight Results File (Computational Engineering International (CEI))
CASE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CASECONVERT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CASTLE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAT	Advanced Disk Catalog Disk Catalog (Elcomsoft)
CAT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAT	Catz Cat Description File (Ubisoft Entertainment)
CAT	Casio Calculator Program (Casio Computer Co., Ltd.)
cat	UNIX Configuration File
CAT	Security Catalog (Microsoft Corporation)
CAT	Todd Osborne Directory Catalog
CAT	PhotoStudio (ArcSoft, Inc.)
CAT	OzWin CompuServe E-mail/Forum Access Catalog File
CAT	dBASE Catalog
CAT	Cognos Impromptu Database Report
CAT	Rational Rose Logical Package (IBM)
CAT	TAPCIS Forum Library Catalog
CAT	Quicken IntelliCharge Categorization File (Intuit Inc.)
CAT	TablEdit Chord Catalog
cat	UNIX Message Catalog File
CATALOG	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CATALOG	CATIA Catalog (Dassault Systèmes)
CATANALYSIS	CATIA (Dassault Systèmes)
CATDRAWING	CATIA Drawing (Dassault Systèmes)
CATEGORIES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CATFCT	CATIA (Dassault Systèmes)
CATMATERIAL	CATIA Material Specification (Dassault Systèmes)
CATPART	CATIA Part Description (Dassault Systèmes)
CATPROCESS	CATIA Process Description (Dassault Systèmes)
CATPRODUCT	CATIA Product Description (Dassault Systèmes)
CATSHAPE	CATIA Shape (Dassault Systèmes)
CATSWL	CATIA (Dassault Systèmes)
CATSYSTEM	CATIA (Dassault Systèmes)
CAULDRON	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAVE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CAZ	Computer Associates Archive (CA)
CA_	Cakepro Compressed Audio File
CB	CoolBasic Source File (CoolBasic Software)
CB	Gigascape Virtual Town Project (Third Dimension Limited)
CB	COMBAS Source Code (Living Byte Software GmbH)
CB	Brief Macro Source Code
CB	Clean Boot File (Microsoft Corporation)
CB	Crystal Button File
CB3	CliBench Mk III SMP 0.7.10
CB4	Analytics Cube (Actuate Corporation)
CBC	CubiCalc Fuzzy Logic System File
CBCP	CodeBaby Production Studio Character Package (CodeBaby Corp.)
CBCX	Comic Book Creator Comic Book Save File Format (Planetwide Media)
CBD	System DLL Catroot File
CBD	WordPerfect Dictionary File (Corel Corporation)
CBD	MapBrowser/MapWriter Vector Map Data
CBF	Infinity Game Engine Archive of Resources (BioWare Corp.)
CBF	Calendar Builder Saved Calendar (RKS Software)
CBF	CoffeeCup Button Factory Button (CoffeeCup Software, Inc.)
CBH	ChessBase Chess Database File
CBI	IBM Mainframe Column Binary Formatted File
CBIN	CACTVS Chemical Binary Format
CBK	National Construction Estimator 32 Costbook
CBK	System DLL Catroot File
CBK	Giza Specifier Drawing Backup File (20-20 Technologies)
CBK	Kreon Scanner File
CBK	CardScan Backup File (Corex Technologies)
CBL	RM/COBOL Development System Source File (Liant)
CBL	Contextual Browsing Language Viewer
CBL	COBOL Program
CBL	PDP-10 COBOL Compiler Source
CBL	CD Box Labeler Pro (Green Point Software UK Ltd.)
CBLE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CBM	XLib Compiled Bitmap
CBM	Fuzzy Bitmap
CBMV	Comic Book Millennium Comic Book Collection (Beaver Valley Software Company)
CBN	PaperMaster Cabinet (j2 Global Communications, Inc.)
CBN	CBN Selector Smart Image (CBN Systems)
CBO	Interactive Training Bookmark (Microsoft Corporation)
CBO	COMBAS Object File / Compiled Program (Living Byte Software GmbH)
CBP	Code::Blocks Project File (The Code::Blocks Team)
CBP	CD Box Labeler Pro (Green Point Software UK Ltd.)
CBP	CentraBuilder (CentraLearning International)
CBP	Conlab Project (Apix Concrete Solutions)
CBR	CDisplay RAR Archived Comic Book File
CBS	Borland Computer Based Training (Borland Software Corporation)
CBS	Cardbox Macro Script
CBS	Computer Based Training (Microsoft Corporation)
CBS	MasterWord Button Bar Configuration
CBS	Code Breaker Save File (GSCCC, Inc.)
CBS	Calendar Builder Style Sheet (RKS Software)
CBT	Computer Based Training
CBTX	Comic Book Creator Comic Book Page Template File (Planetwide Media)
CBTZ	Comic Book Creator Comic Book Page Template Container File (Planetwide Media)
CBU	Conlab Update Information (Apix Concrete Solutions)
CBV	ChessBase Archive File (ChessBase GMBH)
CBW	Cardbox Workspace
CBX	Rational XDE (IBM)
CBZ	CDisplay ZIP Archived Comic Book File
CC	Picture Window's Color Curve File
CC	ADS Source Code (Autodesk, Inc.)
CC	Trojan Spymaster.A Text File
CC	C++ Program File
CC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CC	KODAK Color Control Profile (KODAK)
CC	CC Language Source Code
CC	dB2K Custom Class File
CC	Visual dBASE Custom Class File
CC1	Briggs Softworks Calendar Commander
CC1	Chem3D Cartesian Coordinates 1
CC2	Calendar Commander Calendar File (Briggs Softworks)
CC2	Chem3D Cartesian Coordinates 2
CC2	ClubControl 2
CC3	CUEcards Professional Database (Marcus Humann)
CC5	Calendar Creator 5.x 6.x File
CCA	CC:Mail Archive File (IBM)
CCA	Multimedia Fusion File (Clickteam)
CCA	Common Component Architecture (CCA) Component (Dept. of Energy Laboratories)
CCAD	ClarisCAD data
CCB	Visual Basic Animated Button Configuration
CCC	Internet Chat (Comic Chat) Conversation/Chatroom Log (Microsoft Corporation)
CCC	WordPerfect Office Calendar File (Corel Corporation)
CCC	FLEXnet Manager (Acresso Software Inc.)
CCC	Curtain Call Native Bitmap Graphic
CCD	Vector CAD Program File
CCD	IsoBuster Data Recovery File (Smart Projects)
CCD	CloneCD Control File (SlySoft Inc.)
CCDOC	Rational CCDoctor Output (IBM)
CCE	Calendar Creator 2 Event File
CCF	Cannondale Motorcycle ECM System Engine Calibration File (Cannondale Corp.)
CCF	CryptLoad Container File (CryptLoad)
CCF	AudioReQuest Control File
CCF	CommView Capture File (TamoSoft, Inc.)
CCF	OS/2 Multimedia Viewer Configuration File
CCF	Remote Control File
CCF	GPS Pathfinder Office Configuration File (Trinble Navigation Limited)
CCF	Card Studio Card File Template (Hallmark)
CCF	Symphony Communications Configuration File
CCF	Cumulus Database (Canto)
CCH	Fabasoft Components
CCH	.NET Configuration and Security Policy File (Microsoft Corporation)
CCH	Photomodeler Photochip Thumbnail File (OES Systems)
CCH	Forgotten Realms Unlimited Adventures (FRUA) Character Reference File
CCH	PhotoModeler
CCH	Corel Chart
CCI	CCITT Group 3 and Group 4 Encoding
CCITT	CCITT Group 3 and Group 4 Encoding
CCJ	Crossword Compiler Compiled Crossword Applet (Antony Lewis)
CCK	Corel Clipart Format (Corel)
CCL	Intalk Communication Command Language
CCL	CCtools Levelset (Translucent Dragon)
CCL	PDP-10 Concise Command Language (Used by COMPIL.EXE to Talk to Compilers)
CCM	CC:Mail Mailbox (IBM)
CCM	Multimedia Fusion Custom Menu (Clickteam)
CCN	Calendar Constructer Calendar Data (Aspire Software)
CCN	Vitalize! Game File
CCN	Multimedia Fusion Express File (IMSI/Design LLC)
CCO	CyberChat Data File
CCO	Command Console Command File (DigitallyCreated)
CCO	MicroSim PCBoard Autorouter Session Output
CCO	XBTX BTX Graphics File
CCP	Two Brothers Software Encrypted File Information (Two Brothers Software)
CCP	CaptureCAM-PRO Screen Recording (Click-N-Learn PTY LTD)
CCP	C Converter Profiles
CCP	CloneCD (SlySoft Inc.)
CCP	CalComp Color Palette File
CCPR	CaptureCAM-PRO (Click-N-Learn PTY LTD)
CCR	Systems Management Server (SMS) Client Configuration Request (Microsoft Corporation)
CCR	HealthFrame ASTM Continuity of Care Record (Records For Living, Inc.)
CCR	Internet Chat Room Shortcut (Microsoft Corporation)
CCRF	Calcomp Raster Bitmap
CCS	TrialDirector Clip Script (inData Corporation)
CCS	CCS-lib File
CCS	CONKY CeZaR Stribas International
CCS	CableNut Configuration Custom Setting File (CableNut Software)
CCT	SIL Hebrew Font System Transliteration Table
CCT	Macromedia Director Shockwave Cast (Adobe Systems Incorporated)
CCT	LogicWorks Schematic File (Capilano Computing)
CCT	MicroSim PCBoard Design Information and Rules For Autorouting
CCT	Windows Live Messenger Contacts File (Microsoft Corp.)
CCT	Railroad Tycoon 3 Car Type Description (PopTop Software Inc.)
CCT	DesignWorks Schematic File (Capilano Computing)
CCV	Crystal Vision Report (CTMS)
CCX	Corel Compressed Exchange File
CCX	Multimedia Fusion Extension (Clickteam)
CCX	Total Annihilation: Counter-Strike
CCX	CorelDraw File
CCXML	Call Control eXtensible Markup Language (W3C)
CCZ	Client-Course Manager Customized Report Distribution File (PTEP Inc)
CC_	Audio Utility Midimach Compressed File
CD	Class Diagram (Unicode)
CD	CD-i OptImage CD Image
CD	cdTree Content List
CD1	Cafeteria Document System Data File (DATAIR Employee Benefit Systems, Inc.)
CD150	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CD2	Cafeteria Document System Custom Text File (DATAIR Employee Benefit Systems, Inc.)
CD2	Click'N Design 3D CD Label (Avery Dennison Corporation)
CDA	CD Audio Track Shortcut
CDA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CDA	Giza Specifier Typical File (20-20 Technologies)
CDAT	Internet Security and Acceleration (ISA) Server Cache File (Microsoft Corporation)
CDB	Turbo C Database (Borland Software Corporation)
CDB	Mactive AdBase Data (Mactive AB)
CDB	SeeYou Waypoint (Naviter)
CDB	The Cleaner Trojan Database (Moosoft Development LLC.)
CDB	SymbianOS Contact Database File
CDB	Nokia 9210/9290 Phone Contact Database (Nokia)
CDB	One Page from a ROM With a View Project File
CDB	Clipboard File
CDB	Pocket Access Database (Microsoft Corporation)
CDB	Giza Specifier Design File (20-20 Technologies)
CDB	CardScan Database (Corex Technologies)
CDB	PowerDesigner Conceptual Model Backup File
CDB	FreeOTFE Keyfile (Sarah Dean)
CDBK	SPSS Database File
CDC	Canvastic Documnet/Drawing (Canvastic)
CDC	Nero CD Cover File (Nero AG)
CDC	CLAN Debug File (Child Language Data Exchange System)
CDC	Chromeleon Driver Configuration Plug-in
CDD	Balder Multiboot Configuration File (Hans Christian Ihlen)
CDD	Claris Draw v 1.2 Document
CDD	CADAM Drawing (Dassault Systemes)
CDD	CD-Architect Driver File (Sonic Foundry)
CDD	Chromeleon Device Driver
CDD	Concept Draw Drawing/Diagram (Computer Systems Odessa, Corp.)
CDD	Cadifra Diagram (Cadifra Inc.)
CDDA	AIFF Audio
CDDS	Midtown Madness 3 Data
CDE	Honeywell Hybrid Control Designer
CDE	CADKEY Dynamic Extension (Kubotek USA Inc.)
CDEV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CDEVSAMPLES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CDF	ASCII Format Describing VRML Worlds
CDF	ANDI/netCDF Mass Spectrometry Data Interchange format
CDF	Xilinx Integrated Software Environment Chain Description File (Xilinx, Inc.)
CDF	Channel Definition Format (Microsoft Corporation)
CDF	Comma Delimited Format
CDF	Unidata NetCDF Graphic File (University Corporation for Atmospheric Research)
CDF	Cyberspace Description Format
CDF	MicroSim PCBoard Component Description File For Bill Of Materials
CDF	InstallShield Components Definition File (Acresso Software Inc.)
CDG	DART Karaoke Studio CD+G File
CDG	CanoDraw Graph (Microcomputer Power)
CDI	Disc Juggler CD Image File
CDI	Phillips Compact Disk Interactive Format
CDI	CD Anywhere Virtual CD (V Communications, Inc.)
CDJ	Disc Juggler File
CDK	OS/2 Saved SKF Format File (IBM)
CDK	CD Katalog (KRISoftware)
CDK	Calamus Document (invers Software)
CDKEY	Protocol Used in Communicating from MediaRemote Server to PC MediaRemote Plug-in
CDL	CADKEY Advanced Design Language (CADL) (Kubotek USA Inc.)
CDL	SignLab Vector Graphic
CDL	CD Label Pro CD Label Pro Project
CDL	CaseWare Working Papers Document Link
CDL	NetCDF CDL Metadata (Unidata)
CDM	PowerDesigner Conceptual Model File
CDM	Compressed Music Format
CDM	Visual dBASE Custom Data Module
CDM	NTI CD&DVD-Maker Image File (NewTech Infosystems)
CDM	Minolta Scanner 3D File (Minolta)
CDM	Novell NetWare Disk Drivers NPA
CDMM	ConceptDraw MINDMAP Mind Map (Computer Systems Odessa Corporation)
CDMP	Windows Color System Device Model Profile (DMP) (Microsoft Corporation)
CDN	Click'N Design 3D CD Label (Avery Dennison Corporation)
CDO	Cdo Navigator
CDO	CADAM Overlay (Dassault Systemes)
CDP	CD/Spectrum Pro
CDP	Ca Visual Objects Platform for Developer (CAVO) (CA)
CDPRJ	CD Menu Creator Project File (Drackon Tech)
CDPX	ConceptDraw PROJECT Document (Computer Systems Odessa Corporation)
CDPZ	ConceptDraw MINDMAP Document (Computer Systems Odessa Corporation)
CDQ	CD Indexer
CDR	Sound File
CDR	Raw Audio-CD Data
CDR	Elite Plus Commander Saved Game
CDR	Corel Vector Graphic Drawing (Corel Corporation)
CDR	Final Cut Pro CD/DVD Image File (Apple Inc.)
CDR	GameJack Virtual CD or DVD Image (S.A.D. GmbH.)
CDRZIP	DICOM Zipped Image Archive
CDS	ChemDraw Stationery Document
CDS	Delphi TClientDataset Data (Borland Software Corporation)
CDS	United States Postal Service Computerized Delivery Sequence
CDS	TrialDirector Input File (inData Corporation)
CDSC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CDSG	DrawMusic Chord Song (Conrad Albrecht)
CDT	CorelDraw Template (Corel)
CDT	STABCAL (stability calculation for aqueous systems) File
CDT	MRS-802 Album Data (Zoom Corporation)
CDT	ImgBurn CD-Text (LIGHTNING UK)
CDT	ProWORX Nxt Temporary Long Comment Data (Schneider Electric)
CDU	CDU Paint
CDV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CDV	CatDV Media Catalog (Square Box Systems Ltd.)
CDW	CADKEY Organized Dialog File (CADKEY)
CDW	CeledyDraw Drawing (Celedy Software Inc.)
CDW	KOMPAS Drawing (ASCON)
CDX	Alpha Five Table Index (Alpha Software, Inc.)
CDX	Visual Foxpro Index (Microsoft Corporation)
CDX	iAnywhere Index File (Sybase, Inc.)
CDX	MicroStation Cell Library Index (Bentley Systems, Incorporated)
CDX	Corel Draw Compressed Drawing
CDX	Compound Index
CDX	ChemDraw Chemical Structure Exchange File (CambridgeSoft Corporation)
CDX	Active Server Document
CDX	NovaBACKUP Backup Database Index (NovaStor Corporation)
CDXL	Old Amiga Movie Format
CDXML	ChemDraw XML ChemDraw Format
CDZ	ROM With a View Project File
CDZ	Cadenzo Music File (Heiko Hinz)
CE	Computer Eyes, Digital Vision
CE	FarSide Computer Calendar File
CE	CA Clipper Workbench Application
CE1	Computer Eyes Raw Low Resolution Image
CE2	Computer Eyes Raw Medium Resolution Image
CE3	Calendar Creator 3.x 4.x Event List
CEB	Apabi eBook
CEC	Colombia en Cifras Financial Archive (Lunasoft Colombia Ltda.)
CEF	Class Action Gradebook Elementary Edition Data File (CalEd Software)
CEF	CA Clipper Workbench Application
CEF	CruzerLock Encrypted File (SanDisk Corporation)
CEF	Spaix PumpSelector Catalog Exchange Format (VSX - VOGEL SOFTWARE GMBH)
CEF	CenturionMail Encrypted File (CenturionSoft)
CEG	Continuous Edge Graphic Bitmap (Edsun)
CEG	Tempra Show Bitmap Graphic
CEI	CRiSP Harvest File
CEL	Audition Loop File (Adobe Systems Incorporated)
CEL	MicroStation Cell Library (Bentley Systems, Incorporated)
CEL	Lumena CEL Bitmap (Time Arts Software)
CEL	KiSS Paper Doll File
CEL	Celestia 3D Rendering Script
CEL	CIMFast Event Language File
CEL	Animator Graphic (Autodesk, Inc.)
CEL2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CELL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CELLAR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CELTIC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CELX	Celestia 3D Rendering Script
CEM	Computer Graphics Metafile
CEM	Empire Earth Game File
CEN	Master Tracker Financial Analysis
CEO	Extension associated with Winevar Worm
CEP	CostOS Estimating Project Database File (Nomitech Unlimited)
CER	Sierra Print Artist Certificate
CER	Internet Security Certificate File
CER	MSI Cerius II Chemical Format File (Accelrys Software Inc.)
CER	Cerius2 (Accelrys Software Inc.)
CER	Creatacard Certificate Project (Broderbund)
CER	Lahey Fortran Compilation Error Messages
CES	Sheffield Dictionary File
CEV	Software License Tracking Tool
CEV	LOUT Character Encoding File
CEX	The Currency Exchanger Rate File
CEX	INMOS Transputer Development System Occam User Program
CEX	CLAN Output File (Child Language Data Exchange System)
CEX	ThumbsPlus File
CF	Sendmail Configuration File
CF	Imake Configuration File
CF	CFwin Project Data (Procedimientos-Uno, S.L.)
CF	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CF1	Common File Format 1
CF2	Common File Format 2
CF4	Catfish File Manager Support File
CFA	Premiere Pro Audio File (Adobe Systems Incorporated)
CFB	Inmos Binary Configuration File
CFB	Comptons Multimedia File
CFC	Cold Fusion Component File (Adobe Systems Incorporated)
CFD	CryptoForge Document (Ranquel Technologies)
CFDG	Context Free Design Grammar
CFE	CryptoForge Encrypted File (Ranquel Technologies)
CFF	Capabilities File for FOUNDATION Fieldbus H1
CFF	BoomTracker 4.0
CFF	Common File Format
CFG	Pro/ENGINEER Configuration (PTC)
CFG	Flight Simulator Aircraft Configuration File (Microsoft Corporation)
CFG	Proxomitron Configuration File (Scott R. Lemmon (deceased))
CFG	Configuration
CFH	Capabilities File for FOUNDATION Fieldbus HSE
CFI	CleverForm Script File (Code Development Ltd.)
CFIG	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CFK	Kardplay 1.62 File
CFK	MS Developer Studio Diagram
CFL	Compressed File Library File (Compressed File Container)
CFL	Corel Flowchart File
CFL	Developer Studio Diagram (Microsoft Corporation)
CFM	Cold Fusion Template File
CFM	Visual dBASE Windows Customer Form
CFM	Corel FontMaster
CFML	Cold Fusion Markup Language
CFN	Calamus Font Data (invers Software)
CFO	Turbo C (Borland Software Corporation)
CFO	TCU Turbo C Utilities C Form Object
CFP	Complete Fax Portable Fax File
CFP	QuickBooks Cash Flow Projector File (Intuit Inc.)
CFR	NRC Inspection Manual CFR Guidance
CFR	IBM Configurator Report
CFS	ChatFactory Script (ChatFactory Team)
CFS	Signal Data (Cambridge Electronic Design Limited)
CFS	Inmos Configuration File
CFT	Animation Studio CFast Graphics File (Disney)
CFT	Flow Chart; Corel Flow Template
CFT	Cumberland Family Tree
CFW	ChemFinder Form
CFX	Casio Algebra FX 2.0 Add-in (Casio Computer Co., Ltd.)
CFX	Creative DSP File
CFX	Flow-Cal File
CG	Chord Groover Guitar Song (Guitartab.co.uk)
CG	Cg Toolkit Shader (NVIDIA Corporation)
CG	Norton Crashguard File
CG3	Cabri 3D License File (CABRILOG SAS)
CG3	Dungeons & Dragons Character File (Wizards of the Coast, Inc.)
CGA	CGA Resolution BMP Bitmap
CGA	Color Graphics Adapter Graphics Data
CGA	Ventura CGA Screen Characters
CGB	Gameboy Color
CGF	Asm Objasm
CGF	Family Tree Creator Deluxe (Broderbund)
CGF	Egrid32 Grid Format File (Elias Montoya)
CGF	ProWORX Nxt CODEGEN Batch File (Schneider Electric)
cgi	Common Gateway Interface Script
CGL	CodeGuard Error Log
CGM	Computer Graphics Metafile [Old Style]
CGM	Computer Graphics Metafile [New Style]
CGO	Railroad Tycoon 3 Car Properties (PopTop Software Inc.)
CGP	PixelCryptor Package File (CodeGazer)
CGP	DVDFab Change Graphic Picture (Fengtao Software Inc.)
CGP	NetCaptor CaptorGroup (Stilesoft, Inc.)
CGR	Quest3D Program Part (Act-3D B.V.)
CGR	CATIA Drawing (Dassault Systèmes)
CGT	GOLD Parsing System Table (Devin Cook (and Contributors))
CH	String Data Storage (Encrypted)
CH	String Data Storage
CH	Clipper Header
CH	OS/2 Configuration File
CH1	Freelance Graphics CHart (IBM)
CH1	ViewChoice (Payroll Associates, LLC)
CH10	IRIG 106 Original Recording File (Range Commanders Council)
CH3	Harvard Graphics Chart (Harvard Graphics)
CH4	Charisma 4.0 Presentation
CHA	mIRC Chat File
CHA	Challenger Encrypted File (it-com4)
CHA	PageMaker Kerning Data (Adobe Systems Incorporated)
CHA	Character Data
CHA	CLAN Frequency Sample File (Child Language Data Exchange System)
CHANG	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHANGE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHANGELOG	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHANGER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHANGES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHANGES	Squeak Change File
CHAR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHAR1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHAR2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHAR3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHAR4	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHARSET	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHART	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHART2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHAT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHAT	PIRCH98 Chat File
CHATLOG	Adium Chat Log (Adium Team)
CHB	Oledb Checkbook File
CHD	MAME Compressed Hard Disk File (MAME Team)
CHD	Ares Font Chameleon Font Descriptor
CHD	ViewChoice (Payroll Associates, LLC)
CHD	ChartFX File
CHE	CHwinEHE Control Data (Procedimientos-Uno, S.L.)
CHEAT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHEAT	The Sims Custom Settings (Electronic Arts, Inc.)
CHEATS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHECK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHECKER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHESSREV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHESSTITANSSAVE-MS	Chess Titans Saved Game File (Microsoft Corporation)
CHF	pcAnywhere Remote Control File
CHG	Quicken On-line Data File (Intuit Inc.)
CHG	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHGR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHH	C++ Header
CHI	Help File Index (Microsoft Corporation)
CHI	TOMBO Encrypted File (Tomohisa Hirami and TOMBO Maintainers)
CHI	ChiWriter Document
CHIME	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHIMES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHJ	Help Composer Project
CHK	Starcraft Campaign Map
CHK	Sophos Intercheck File
CHK	SSConvert Multilanguage Video Subtitle Data (Screen Subtitling Systems Ltd.)
CHK	Blue Coat ProxySG ProxySG Image File (Blue Coat Systems Inc)
CHK	CHKDSK/SCANDISK Output
CHK	3D Movie Maker Interface Data File (Microsoft Corporation)
CHK	WordPerfect Temporary File (Corel Corporation)
CHK	EpiData Check File (EpiData Association)
CHKEXP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHKJAIL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHL	Chromeleon Channel Raw Data
CHL	Configuration History Log
CHL	Internet Explorer Channel Information (Microsoft Corporation)
CHL	ConTEXT Highlighter (ConTEXT Project Ltd.)
CHL	RealPlayer Live Channel
CHL	Chile Compressed File
CHL	Black and White 2 Game Data Script (Lionhead Studios)
CHM	ChemDraw Chemical Structure (CambridgeSoft Corporation)
CHM	HTML Help Compiled Help File (Microsoft Corporation)
CHM	Ares Font Chameleon Source Font - Font Outline
CHN	Ethnograph Data File
CHO	Ares Font Chameleon Output Font
CHO	Animation:Master Choreography (Hash)
CHO	Chord Pro Song Format (Mussoft)
CHOICE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHOOCHOO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHOPIN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHOPPER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHOPRO	Chord Pro Song Format (Mussoft)
CHOR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHORALE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHORD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHORDHARM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHORDPIANO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHORES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHORUS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHP	BizInt Smart Charts for Patents Document (BizInt Solutions)
CHP	FLOWer (Pallas Athena)
CHP	CodeHealer Project File (SOCK Software, LLC)
CHP	Ventura Publisher Chapter (Corel Corporation)
CHP	DVD Chapter File
CHQ	Help Combined Full-text Search File (Microsoft Corporation)
CHR	Wormhole 2.0/ Liero Graphics Editor Liero Graphics Mod
CHR	Borland Language Stroke Font File (Borland Software Corporation)
CHR	Character or Font File
CHR	Infinity Game Engine Exported Character Info (BioWare Corp.)
CHRISTMAS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHROMAFONT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHS	ATI Radeon Video Driver
CHS	ChessRally Saved Game/E-mail Attached Game (Ingenuware, Ltd.)
CHS	Corel WP Chart Style
CHT	ChartViewer dBASE Interface File
CHT	Navigator Vector Chart File (Tecepe)
CHT	ICQ Saved Chat Session (ICQ Inc.)
CHT	ChartFX Template File
CHT	BizInt Smart Charts for Drug Pipelines Document (BizInt Solutions)
CHT	Chartist from Novagraph
CHT	My Health Software Chart (My Health Software)
CHT	SPSS Template (SPSS, Inc.)
CHT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHT	ZSNES Cheat Code (ZSNES Team)
CHT	Sierra Generations Family Tree Chart (Sierra Entertainment, Inc.)
CHT	Harvard Graphics Vector File (Harvard Graphics)
CHT	Cheat Machine Data File
CHT	Novagraph Chartist File
CHU	Infinity Game Engine GUI Elements File (BioWare Corp.)
CHURCH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CHUZZLEDELUXESAVEDGAME	Chuzzle Deluxe Saved Game (PopCap Games, Inc.)
CHW	HTML Help General Index Funtionally comparable to .GID.
CHX	ZX-Editor Second Edition Big Font Files (OmikroN-Software)
CHZ	ChArc Compressed File Archive
CI	CitectSCADA File
CI2	Calin Lawyer's Interest Calculator Ver 2 Data File (Lawtech (Aust) Pty Ltd.)
CI3	Calin Lawyer's Interest Calculator Data File (Lawtech (Aust) Pty Ltd.)
CIA	Sheffield Dictionary File
CID	coDiagnostiX User Defined Implant (IVS Solutions AG)
CID	Navigator Chart Image Description (Tecepe)
CID	CallerID File (AnalogX)
CIDA	xplorer² Scrap File Document (Nikos Bozinis)
CIDF	Creative ID Document File (Creative ID Software)
CIF	pcAnywhere Caller File
CIF	Chip Layout Information
CIF	Easy CD Creator Image (Sonic Solutions)
CIF	Ariba Buyer Catalog Information Format (Ariba Inc.)
CIF	CalTech Intermediate Graphic
CIF	Ventura Chapter Information
CIF	Creator Document File (MultiAd, Inc.)
CIF	Ventura Converted Image File
CIF	Crystallographic Information File
CIF	Colombo Ipermedia File
CIG	Fastback Plus Compressed Backup
CIK	Norton CleanSweep Installation Log (Symantec Corporation)
CIK	Corel Graphics Ver. 10 Custom Dual Tone File (Corel)
CIL	Norton CleanSweep Installation Log (Symantec Corporation)
CIL	Clip Gallery Download Package (Microsoft Corporation)
CIM	The Ultimate Draw C Text Mode Image File
CIM	SimCity 2000 (Electronic Arts, Inc.)
CIM	GE Industrial Systems CIMPLICITY HMI Screen
CIM	CIMEX Cimpack Design Drawing File
CIM	CompuApps Drive Backup Image
CIN	Photo-Sonics Picture Sequence
CIN	Cinemania (Microsoft Corporation)
CIN	Digital Moving Picture Exchange Bitmap (The Society of Motion Picture and Television Engineers)
CIN	Cineon Bitmap (Kodak)
CIN	Calculux Indoor Project (Royal Philips Electronics)
CIN	OS/2 Change Control File
CIN	Cinetitler Digital Screen Subtitling
CIN	Quake II Cinematic Video (id Software)
CIN96LM	See .CIN
CIN96UPD	See .CIN
CIP	CryptoBuddy Encrypted File (Research Triangle Software)
CIP	Ghost Keylogger File
CIPO	Internet Same as .CPI.
CIQ	CableIQ Test Data (Fluke Networks)
CIR	PSpice Circuit File (Cadence Design Systems, Inc.)
CIR	SuperMax E-CAD Save-File Command
CIR	real-PCB Netlist (Crocodile Clips Ltd)
CIRCLES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CIS	TAPCIS Parameter/Address Book/Rates File
CIS	CheckInbox File
CISO	Pismo File Mount Package Compact ISO
CIT	ClockIt Employee Duty Roster (ES-Software.net)
CIT	Norton CleanSweep Installation Log (Symantec Corporation)
CIT	Intergraph Scanned Image (Intergraph Corporation)
CIT	SeeYou Vector Maps (Naviter)
CITY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CIV	Empire Earth Custom Civilization Information (Sierra Entertainment, Inc.)
CIV4REPLAY	Civilization IV Replay File (Firaxis Games, Inc.)
CIV4SAVEDGAME	Civilization IV Saved Game (Firaxis Games, Inc.)
CIV4WORLDBUILDERSAVE	Civilization IV Saved World Builder Data (Firaxis Games, Inc.)
CIX	TCU Turbo C Utilities Database Index
CIX	Rational XDE (IBM)
CJB	cleaner XL Job (discreet (an Autodesk Company))
CJP	WinOnCD Project File (Sonic Solutions)
CK	ChucK Source Code (ChucK Team)
CK1	iD/Apogee Commander Keen 1 Data File
CK2	iD/Apogee Commander Keen 2 Data File
CK2	iD/Apogee Commander Keen 1 Data File
CK2	ViewChoice (Payroll Associates, LLC)
CK3	iD/Apogee Commander Keen 3 Data File
CK3	iD/Apogee Commander Keen 1 Data File
CK4	iD/Apogee Commander Keen 1 Data File
CK4	iD/Apogee Commander Keen 4 Data File
CK5	iD/Apogee Commander Keen 5 Data File
CK5	iD/Apogee Commander Keen 1 Data File
CK6	iD/Apogee Commander Keen 6 Data File
CK6	iD/Apogee Commander Keen 1 Data File
CKA	Comfort Keys Database (Comfort Software Group)
CKB	C++ Keyboard Mapping File (Borland Software Corporation)
CKD	KeyCreator Design Container File (Kubotek USA Inc.)
CKD	CADKEY Workshop Design File (Kubotek USA Inc.)
CKF	Music Data Management Software Casio Keyboard File (Casio Computer Co., Ltd.)
CKI	Off by One Browser Persistent HTTP Cookies (Off By One Productions, a division of Home Page Software Inc.)
CKO	KnockOut 2 Image Mask (Corel)
CKP	Ingres Checkpoint File (Computer Associates International, Inc.)
CKP	Valise Secure Archive (CertainKey, Inc.)
CKT	CircuitMaker Schematic (Altium Limited)
CKT	KeyCreator Template File (Kubotek USA Inc.)
CKT	B2 Spice Curcuit Design (Beige Bag Software, Inc.)
CKT	Crocodile Clips
CKV	CheckVision Database (CheckVision GmbH)
CKX	ChucK Plug-in (ChucK Team)
CL	ArtIcons Pro Cursor Library (Aha-soft)
CL	CLwin Project Data (Procedimientos-Uno, S.L.)
CL	Generic LISP Source Code
CL3	Easy CD Creator Layout File (Sonic Solutions)
CL3	Bruker Aspect NMR Data File
CL4	Easy CD Creator Ver 4 Layout File (Sonic Solutions)
CL5	Easy CD Creator Layout File (Project) (Sonic Solutions)
CLA	CLASS336 Markup Language
CLA	Clarion for DOS Source Code (SoftVelocity)
CLA	Java Class File (Sun)
CLAP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLASS	Java Bytecode (Sun Microsystems, Inc.)
CLASS	Java Class File (Sun Microsystems, Inc.)
CLASS	Gambas Gambas Class Source File (Gambas Team)
CLASS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLB	cdrLabel Compact Disc Label
CLB	Total Club Manager Single Club Info (Electronic Arts Inc.)
CLB	Corel Library
CLB	ICQ Contact List (ICQ Inc.)
CLB	COM+ Catalog File
CLB	Office XP Developer Code Librarian (Microsoft Corporation)
CLB	Super NoteTab ClipBook Template
CLBX	MP3 Automagic CD Cover Creator (MACCC) Label (Brian Pipa and PipaSoft)
CLC	Corel Catalog
CLC	Schedule+ 7-Habits Mission Statement (Microsoft Corporation)
CLC	UltimaCalc Calculation Data File (UltimaCalc)
CLD	ClamWin AntiVirus Database (Clam AntiVirus Team)
CLD	Terragen Cloud Layer File (Planetside Software)
CLD	Skerryvore Software Simply Calenders
CLD	CD Label Designer Design File (Dataland Software)
CLD	Clam AntiVirus Database (Clam AntiVirus Team)
CLD	CD-Label Print Label Layout File (Canon, Inc.)
CLD	CA Clipper Debugger Configuration File
CLDLYR	Terragen Cloud Layer File (Planetside Software)
CLE	Icon Lock-iT Locked File Indicator (Moon Valley Software, Inc.)
CLEAN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLEANER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLEAR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLEARANCE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLF	DesignWorks Symbol Library (Capilano Computing)
CLF	ListPro Database (Ilium Software, Inc.)
CLG	CollageMaker Graphic (Galleria Software)
CLG	Maxagrid CTM Log File
CLG	Disk Catalog Database
CLI	Client Management System Customer File (HawkSoft, Inc.)
CLICK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLIP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLIP1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLIP2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLJ	Clojure Source Code (Rich Hickey, Open Source Project Sponsor)
CLK	R.A.V.E. Animation File (Corel)
CLK	WatchGuard Cloaked File (WatchGuard Technologies, Inc.)
CLK	ClickFORMS Data (Bradford Technologies Inc.)
CLKK	Clicker Keyboard (Crick Software Ltd.)
CLKT	Clicker Template (Crick Software Ltd.)
CLKW	Clicker Word Bank (Crick Software Ltd.)
CLKX	Clicker Grid Set (Crick Software Ltd.)
CLL	OzWin CompuServe E-mail/Forum Access Custom Library Search
CLL	Clicker (Crick Software Ltd.)
CLM	Micrografx Picture Publisher 7 Macro
CLMOV	Clan Lord Movie - Visiostone (Delta Tao Software)
CLN	Backup Configuration File
CLO	Cloe Ray-Tracer
CLO	SPSS Chart Look (SPSS, Inc.)
CLOCK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLOE	Cloe Ray-Tracer
CLOG	SpreadMaster Client Log (SpreadMaster.net)
CLOSED	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLOUD	GOM Atos Scanner File
CLOUD	Homeworld Cloud Data (Sierra Entertainment, Inc.)
CLP	DeskMate Clip
CLP	Clipper 5 Compiler Script
CLP	CLIPS/wxCILPS File
CLP	GoDot
CLP	PC Paint/Pictor Picture
CLP	Windows Clipboard/Picture
CLP	Quattro Pro Clip Art (Corel)
CLPI	Blu-ray Clip AV Stream File (Blu-ray Disc Association)
CLR	Flash Color Table File (Adobe Systems Incorporated)
CLR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLR	WinMX Color Scheme (Frontcode Technologies)
CLR	PhotStyler Color Definition
CLR	WinEdit Colorization Word List
CLR	Boxer/2 Color Scheme
CLR	FileMaker Spelling Dictionary
CLR	1st Reader Binary Color Screen Image
CLR	Vue Color Maps (e-on software, inc.)
CLS	MS VB-4 Class Module Add-In
CLS	JavaScript Class
CLS	Visual Basic Class Module
cls	LaTeX Class Definitinon
CLS	ArcView Geocoding Classification File (ESRI)
CLS	C++ Class Definition
CLS	MS VisC++/Visual Basic Class Definition
CLT	VisualBoyAdvance Cheat List (Forgotten and VBA Team)
CLU	IBM PCI Cryptographic Coprocessor Code File (IBM)
CLU	CLUCalc Geometric Algebra Description (CLUScript File) (Christian Perwass)
CLU	XNBC V8 Biological Neural Network Simulation Workstation Cluster Names
CLU	Broken Sword 2 Dialog File (THQ Inc.)
CLU	Phantasmagoria 2 8-bit Playback Pallete File
CLU	Clusse Node File (Heikki Hannikainen)
CLUB	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLUBS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CLV	Vbox Current Language File (Aladdin Knowledge Systems)
CLV	Clovis for Outlook Schema Settings (Steelhead Systems)
CLV	Yamaha Cool Voices (Yamaha Corporation of America)
CLW	Visual C++ Class Wizard File (Microsoft Corporation)
CLW	Clarion for Windows Source Code (SoftVelocity)
CLX	Ceelox SecureMail Encrypted Document (Ceelox Inc.)
CLX	Acrobat (Adobe Systems Incorporated)
CLX	Macro ToolsWorks Macro
CLX	Rational XDE (IBM)
CLY	ACT! Layout (Best Software CRM Division)
CLY	Corel Graphics Ver.10 Custom Layouts File (Corel)
CL_	C Poet compressed Disk1 File
CM	Craftman Data File
CM	Unix Puzzle 8-bit Bitmap
CM1	CaseMap Version 1.x Case Analysis File (LexisNexis)
CM2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CM2	CaseMap Version 2.x Case Analysis File (LexisNexis)
CM2	Curious Labs Poser Camera File
CM3	CaseMap Version 3.x Case Analysis File (LexisNexis)
CM4	Championship Manager 4 Saved Game (Sports Interactive Ltd.)
CM4	CaseMap Version 4.x Case Analysis File (LexisNexis)
CM4	ClipMate Data File
CM5	CaseMap Version 5.x Case Analysis File (LexisNexis)
CM6	CaseMap Version 6.x Case Analysis File (LexisNexis)
CM7	CaseMap Version 7.x Case Analysis File (LexisNexis)
CMA	Filetopia Collection Manager List (Filetopia)
CMA	Applix TM1 Database
CMA	Camomile Library File
CMA	Coach 6 Activities File (Foundation CMA - Centre for Microcomputer Applications)
CMAP	CmapTools Concept Map (IHMC)
CMAP	Hex Workshop Color Map File (BreakPoint Software, Inc.)
CMB	Reason Combinator Instrument Patch (Propellerhead Software)
CMB	Xtree for Windows Button Bar
CMB	Chromeleon Backup Archive
CMBL	Logger Pro Data (Vernier Software & Technology)
CMBX	#develop (SharpDevelop) Combine File (IC#Code)
CMC	PowerFront File
CMC	Collectorz.com Comic Collector Collection Data (Collectorz.com)
CMD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CMD	PDP-10 Indirect Command File
CMD	Command File for Windows NT (Microsoft Corporation)
CMD	dBASE II Program File
CMD	OS/2 REXX Batch File
CMD	1st Reader External Command Menu
CMD	Summit Contact Manager Contact Database (MIE Software Pty Ltd)
CMD	DOS CP/M Command File
CMD	OS/2
CMD5	CrystalMaker Data (CrystalMaker Software Ltd.)
CMDF	CrystalMaker Data (CrystalMaker Software Ltd.)
CMDR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CME	Crazy Machines Level File (Pepper Games)
CMF	Connection Manager Fixer File
CMF	Creative Music File
CMF	CaseMap File Viewer Definition (LexisNexis)
CMF	MapPoint 2006 Map File (Microsoft Corporation)
CMF	Corel Metafile
CMF	CopyMate Data File (GraphiTech Ltd.)
CMG	cramfs ROM Filesystem Package
CMG	Chessmaster Saved Game (Ubisoft Entertainment)
CMI	Camomile Interface File
CMI	CD Mate CD Burning Image File (An Chen Computers Co. Ltd.)
CMK	Card Shop Plus File
CML	Filetopia Collection Manager List (Filetopia)
CML	PADGen Company Info File
CML	ProWORX Nxt Comment Data (Schneider Electric)
CML	Chemical Markup Language Document
CML	Cheat Machine Library File
CML	Crazy Machines Saved Laboratory File (Pepper Games)
CMM	CEnvi (ScriptEase:Desktop) Batch File
CMMF	CrystalMaker Data (CrystalMaker Software Ltd.)
CMMP	Camtasia Studio Menu Maker Project (TechSmith Corporation)
CMMTPL	Camtasia Studio Menu Maker Template (TechSmith Corporation)
CMN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CMN	Systems Management Server (SMS) Collection Membership Update (Microsoft Corporation)
CMO	Spanish Whiz What Did You Say? Sound File (GB Blanchard)
CMO	Virtools Behavioral Server Composition
CMP	CorelDRAW Postscript Printer Header
CMP	HotDocs Template Component File (Matthew Bender & Company, a member of the LexisNexis Group)
CMP	Generic CADD Component File
CMP	Discorp CMP Image
CMP	Internet Explorer Custom Menu Plug-in (Microsoft Corporation)
CMP	Route 66 Address Document
CMP	CraftMan Data
CMP	JPEG Bitmap
CMP	PKWare Compression Library Compressed Data
CMP	Technics Keyboard Composer File
CMP	Photofinish Calibration MaP
CMP	Word for DOS User Dictionary (Microsoft Corporation)
CMP	THEOS Compressed Archive (THEOS Software Corporation)
CMP	Open Access File
CMP	SWAT 3 Compressed Sound File
CMP	Leadview (LEAD) Bitmap
CMP	Freelancer Physical Model Layout (Microsoft Corporation)
CMP	CaseMap Send To TimeMap Plug-in (LexisNexis)
CMP	Giza Specifier Color Map (20-20 Technologies)
CMP	Chord Pro Song Format (Mussoft)
CMP	Address Document
CMPRB	CaseMap ReportBook Plug-in (LexisNexis)
CMPROJ	Channel Master Project (SharpC Consulting Group)
CMPT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CMQ	Culturemetrics
CMR	MediaPlayer Movie
CMR	CribMaster File
CMR	SeeYou Raster Maps (Naviter)
CMR	Coach 6 Saved Results File (Foundation CMA - Centre for Microcomputer Applications)
CMRBK	CaseMap ReportBook Definition (LexisNexis)
CMRT	CraftMan Data
CMS	Coach 6 Project File (Foundation CMA - Centre for Microcomputer Applications)
CMS	CaseMap Case Script (LexisNexis)
CMS	TrialDirector Case File (inData Corporation)
CMS	TrialDirector Compound Media Storage
CMT	Chinon ES-1000 Digital Camera
CMT	e-Sword Commentary (Rick Meyers)
CMT	Corel Draw
CMT	Culturemetrics
CMTD	Cool Moon To Do To Do List (Cool Moon Software, LLC.)
CMU	Carnegie Mellon Univeristy Stereo Raster Image
CMU	Andrew Toolkit CMU Format (Andrew Consortium)
CMU	CMU Window Manager Bitmap
CMUWM	Carnegie Mellon University (CMU) Window Manager Bitmap
CMV	CorelDRAW 4.0 Movie Animation (Corel Corporation)
CMV	Creative Zen/Centrale Media Player Video File (Creative Technology Ltd.)
CMW	COM-Watch
CMW	Custom Maintenance Wizard File (Microsoft Corporation)
CMX	The Sims 3D Body Mesh Data (Electronic Arts (Maxis))
CMX	Apple Viewer (Apple Inc.)
CMX	Patch File
CMX	Rational XDE (IBM)
CMX	Presentation Exchange Image (Corel)
CMX	Qualcomm CMX Ringtone
CMXA	Camomile Packed Library File
CMY	Corel40 Custom File
CMYK	Raw Cyan, Magenta, Yellow, and Black Samples
CN	CNwin Project Data (Procedimientos-Uno, S.L.)
CNA	Catena Data File (OpEx Software LLC)
CNB	Pegasus Mail Mail Message in Noticeboard (David Harris)
CNC	CNC General Program Data
CNC	Click 'n Create File (Clickteam)
CNC3REPLAY	Command & Conquer 3 Replay (Westwood Studios)
CND	ControlDraw File
CND	Embroidery Design File
CNDF	Compressed Channel Data File Contains data about satellite TV channels.
CNF	Configuration File Used by Telnet, Windows, and other applications with varying internal formats.
CNF	Inor MinIpaq Software File
CNF	Windows SpeedDial (Microsoft Corporation)
CNF	1-2-3 Configuration (IBM)
CNF	minisat or ubcsat Connective Normal Form Logic Equations (SATLIB - The Satisfiability Library)
CNF	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CNF	Conference Link
CNF	KiSS Paper Doll Set
CNM	Pegasus Mail New Mail Message (David Harris)
CNM	WinRoute Electronic Mail File (Kerio Technologies Inc.)
CNM	NoteMap Outline File (LexisNexis)
CNM	Windows Application Menu Options and Setup File
CNQ	WebShop Platinum Project File (Boomerang Software, Inc.)
CNQ	Compuworks Design Shop File
CNR	CRiSP Harvest File
CNR	Pegasus Mail Mail Message in Systemwide Folder (David Harris)
CNR	Click'N'Run Installation Package (Linspire,Inc.)
CNREG	EULANDA Warenwirtschaft (ERP) Configuration Information
CNREP	EULANDA ERP System Report Template
CNS	Windows2000 Client Connection Manager Export File (Microsoft Corporation)
CNT	Rational Rose 98 Contents Tab File (IBM)
CNT	Help File Contents
CNV	WS_FTP Pro Upload Conversion File Data
CNV	Word Data Conversion File (Microsoft Corporation)
CNV	WordPerfect Temporary File (Corel Corporation)
CNV	DB2 Conversion File
CNV	Canvas Versions 6, 7, 8, 9 Graphic File (ACD Systems Ltd.)
CNX	Rational XDE (IBM)
CN_	Regeditx File
CO	Cobalt v8 3D file (Ashlar-Vellum)
CO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CO	Cult3D ActiveX Player Application (Cycore Systems AB)
CO$	MS Compressed COM Decompress with UNPACK.EXE.
COA	Medlin Accounting Chart of Accounts With Beginning of Year Balances (Medlin Accounting)
COA	TrueSpace 3D Object (Caligari Corporation)
COB	TrueSpace2 Object
COB	Total Annihilation Unit Script (Cavedog Entertainment)
COB	COBOL Program File
COB	RM/COBOL Runtime System Application File (Liant)
COB	Creatures Compiled Object File (Gameware Development Ltd.)
COB	TrueSpace Object (Caligari Corporation)
COBRA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COCO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COD	Boxer/2 printer Code Definition File
COD	C Compiler Output (Microsoft Corporation)
COD	Code List
COD	Video Text File
COD	UUPC Code Definition Table
COD	Agent Charmap (Forté)
COD	dBASE Application Generator Template Source File
COD	dBASE Template Source File
COD	Forecast Plus
COD	FORTRAN Compiled Code
COD	Multiplan Data File (Microsoft Corporation)
COD	StatPac Gold Datafile
COD	SWAT Input Control File
COD	Compiler Program Code
COD	Blackberry Compiled Java Code (Research In Motion Limited)
COD	Atlantis Word Processor Encrypted Document (Rising Sun Solutions, Inc.)
COD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COD	Charset Code File
CODE	Graal and Related Servers Encrypted Cache (Cyberjoueurs)
CODE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CODE0	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CODE1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CODE2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CODE3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CODE4	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CODEC	Rockbox CODEC (The Rockbox Crew)
CODES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COF	Days Of Death Program/Media Saved Information (ColemanSystems)
COK	Carmageddon Patch File
COKE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COL	MPEG Audio Collection Collection (The MAC Team)
COL	Autodesk Color Palette (Autodesk, Inc.)
COL	SequoiaView Color Template (Technische Universiteit Eindhoven)
COL	Multiplan Spreadsheet (Microsoft Corporation)
COL	HTML Help Collection File (Microsoft Corporation)
COL	IFF Color Map Palette
COL	Notes Import Column Description File (IBM)
COL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COL	Internet Color Wizard Color Scheme
COL	Grand Theft Auto III Collision Data (Rockstar Games)
COL	Movie Maker Collection File (Microsoft Corporation)
COLA	Cola Source Code (The Perl Foundation)
COLLAPSE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COLLECTION	Shareaza Collection (Shareaza Pty. Ltd.)
COLLOQUYTRANSCRIPT	Colloquy Chat Transcript (Javelin.cc)
COLOGNELA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COLOR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COLOR	Amaya Configuration
COLOR2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COLORS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COM	Command
COM	Common Object Module
COM	DOS or CP/M Executable
COM	EICAR Anti-Virus Test File (EICAR)
COM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COM	AOL (America Online, Inc.)
COM	Psion Organiser CommsLink Setup File (Psion PLC)
COM2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMBAT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMFYCAKESSAVE-MS	Purble Place Saved Game (Microsoft Corporation)
COMICSCARTOON	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMING	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMMANDLINE	Commandline Powertoy File
COMMANDS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMMANDS2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMMENTS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMMON	MATLAB Install File (The MathWorks, Inc.)
COMMS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPACT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPANY	Chris Sawyer’s Locomotion Company Owner Face (Atari Interactive, Inc.)
COMPARE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPARISON	Merge Comparison Report (Araxis Ltd.)
COMPAT	Likely a Text File
COMPAT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPILERS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPLICATIONS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPOSER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPPIANO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COMPRESSOR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CON	Battlefield 1942 Configuration File (Electronic Arts, Inc.)
CON	Tree Professional Conifer Creator File
CON	WordPerfect Document Concordance (Corel Corporation)
CON	Trace Data File (GraphiTech Ltd.)
CON	Train Simulator Train/Model Identification File (Microsoft Corporation)
CON	LucasArts Container File (LucasArts Entertainment Company LLC)
CON	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CON	Unreal 2 Audio File (Epic Games, Inc.)
CON	Knowledgeware Consolidation File
CON	Concept Application Server Source Code (RadGs Software s.r.l)
CON	Simdir Configuration File
CONCERTO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONF	Palace Server Server Configuration (Communities.com)
CONF	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONF	Psitree psitree Router Configuration File
CONF	IRC Related Configuration File
CONF	Linux Configuration File
CONFERENCE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONFIDENT2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONFIDENTIAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONFIG	WatchDirectory Task Information (GdP Software)
config	UNIX Configuration File
CONFIG	NET Application Configuration Information (Microsoft Corporation)
CONFIG	CRiSP Harvest File
CONFIG	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONFIG	Rockbox Configuration File (The Rockbox Crew)
CONFIGDBLINK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONFIGS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONFIGURE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONNECTION	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONSEQUEN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONSOLE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONSOLE	WinNT Console File
CONT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONTACT	Windows Vista Contact File (Microsoft Corporation)
CONTENTS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONTENTSONCLIPBOARD	Contents on Clipboard Powertoy File
CONTROL	Hydrologic Modeling System (HEC-HMS) Control Specifications Data (U.S. Army Corps of Engineers)
CONTROL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONTROLPANEL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONV	Stylus Studio Data Conversion Template (DataDirect Technologies, a division of Progress Software Corporation)
CONV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONVERSIONS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONVERT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONVERT2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CONVERTER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COO	Fabasoft Components
COO	Cookie File
COOKIES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COOL	QB - Text Analyzer Archive (Sierra Vista Software)
COP	Tree Professional Conifer Creator Image File
COPIER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COPIEREC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COPPER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COPY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COPYING	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COPYR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COR	Web GPS Correction Server Export File
COR	WMOVIEC Input File
COR	Cokriging Software COREG Output File
COR	Insight II Output Coordinate File (Accelrys Software Inc.)
COR	Protein Structure File
COR	posem Correction File (Nimal Solutions Ltd.)
CORE	Core Software Tech CORE IDC Bitmap
CORELPROJECT	Photo Album Project (Corel Corporation)
CORELSHOW	MediaOne Enhanced Slideshow File (Corel Corporation)
CORRECT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CORRECTION	As-U-Type Correction FIle (Fanix Software)
CORTOUCHKA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COS	Scarlett Expert System Compiler Query File
COS	Creatures Object Source (Gameware Development Ltd.)
COS3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COSMO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COSMO2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COSMO3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COSMO4	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COSMO5	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COSTS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
COT	Intergraph Raster Graphic (Intergraph Corporation)
COUNT	Gen Counters File
COUNTER	Netobjects Fusion Components Bbscomp Message File
COV	Fax Cover Page (Microsoft Corporation)
COX	Multimedia Fusion Plug-In (Clickteam)
CP	CPIde Component Pascal Source (CFB Software)
CP	Xcode C++ Source (CodeWarrior/XCode) (Apple Inc.)
CP	Audition Script (Adobe Systems Incorporated)
CP	Sound Shared File
CP	CompuMedic Database
CP1	Compel Show Ver 1 Presentation (Click2learn, Inc.)
CP2	Compel Show Ver 2 Presentation (Click2learn, Inc.)
CP8	CP8 256 Gray Scale Image
CP?	LoseThos C+ Source File (Terry A. Davis)
CPA	Cimrex Prog (Beijer Electronics)
CPA	Compass program of the Takahashi
CPA	Premiere Conformed Audio File (Adobe Systems Incorporated)
CPA	Colasoft Capsa
CPAN	Tucows Info File (Tucows Inc.)
CPAO	3dize Cool Page Objects Counter File
CPC	Cartesian Products Compressed Internet Document (Cartesian Products, Inc.)
CPD	Fax Coversheet
CPD	Corel PrintOffice File
CPD	Complaints Desk Script
CPE	Fax Cover Sheet (Microsoft Corporation)
CPF	ProWORX Nxt Comment Pointer And Length File (Schneider Electric)
CPF	Canvastic Preferences (Canvastic)
CPF	CaseMap Portable Format (LexisNexis)
CPF	Complete PC Fax File
CPF	CPF Editor Contract Preparation Form Submission File (CORDIS)
CPF	O&O CleverCache Profile (O&O Software GmbH)
CPF	CircuitCAM Manufacturing Process Definition File (Aegis Industrial Software Corporation)
CPF	IGO 8 3D Buildings Database File (Global Services LLC)
CPG	3dize Cool Page File Tutorial
CPGZ	Compressed UNIX CPIO Archive
CPH	Print House Image (Corel Corporation)
CPI	Cartesian Products Compressed Internet Document (Cartesian Products, Inc.)
CPI	Windows International Code Page (Microsoft Corporate)
CPI	AVCHD Clip Information
CPI	ColorLab Processed Image
CPI	Sietronics CPI XRD Document (Sietronics Pty Ltd)
CPI	Calamus Graphic (invers Software)
CPICS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CPIO	UNIX CPIO Archive
CPJ	CeQuadrant CD Project
CPJ	Commotion File
CPK	Sega FILM/CPK File Format (Sega of America, Inc.)
CPL	Corel Color Palette (Corel)
CPL	Windows Control Panel Extension (Microsoft Corporation)
CPL	TrialDirector Concordance File (inData Corporation)
CPL	Compel Show Ver 1 Presentation (Click2learn, Inc.)
CPM	Cisco Secure Policy Manager File
CPM	ConceptHDL Project File
CPM	CP/M Executable
CPM	Turbo Pascal DOS File (Borland Software Corporation)
CPM	InterComm Project Manager File
CPN	Age of Empires I and II Campaign File (Microsoft Corporation)
CPN	Rise of Nations Campaign File (Microsoft Corporation)
CPN	CPN Tools CPN Model File (CPN Group at the University of Aarhus)
CPO	Corel Print House File
CPP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CPP	Xcode Core C Program (Apple Inc.)
CPP	Maya OpenGL 3D Scene (Alias Systems, a division of Silicon Graphics Limited)
CPP	C++ Builder 6 (Borland Software Corporation)
CPP	Visual C++ Source Code File (Microsoft Corporation)
CPP	CA-Cricket Presents Presentation
CPQ	Exam Essentials Exam File (Cyber Pass Inc.)
CPR	ConTEXT Project File (Eden Kirin)
CPR	CPC Plus Cartridge Image
CPR	PV-WAVE Compiled Procedure File
CPR	Knowledge Access Graphics
CPR	INMOS Transputer Development System Occam Program Code Fold
CPR	Corel Presents Presentation
CPR	Patrician II
CPR	Port Royale
CPR	Cubase Project File (Steinberg)
CPS	QEMM Backup of Startup Files
CPS	Photo House Image (Corel Corporation)
CPS	Anti-Virus Checksum
CPS	Central Point PC Tools Backup
CPS	Classroom Performance System File
CPS	Colored PostScript File
CPT	dBASE Encrypted Memo
CPT	After Shot (Corel Corporation)
CPT	CCRYPT Encrypted File
CPT	Corel Photo-Paint Image (Corel)
CPT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CPT	Compact Pro Archive (Cyclos)
CPT	CA Cricket Presents Template
CPT6	Corel Photo-Paint Image
CPTHEME	cPanel Theme Package (cPanel, Inc.)
CPU	Sysoft Sandra File
CPX	Rise of Nations Campaign File (Microsoft Corporation)
CPX	Control Panel Applet
CPX	Code Page Translation File (Microsoft Corporation)
CPX	CryptaPix Encrypted Image
CPX	Corel Presentation Exchange Compressed Drawing
CPX	Age of Empires I and II Campaign File (Microsoft Corporation)
CPY	eCopy Scanned Document (eCopy, Inc.)
CPY	RM/COBOL Development System Include File (Liant)
CPY	Flexus COBOL Definitions
CPY	Atari Ramdrive CPY Commands
CPY	Copy Books Data File
CPY	Cobol Include
CPZ	COMPOZ Music Text
CPZ	LoseThos C+ Source File (Terry A. Davis)
CPZ	CP Shrink Archive (Symantec Corporation)
CQ	CP/M SYSGEN Replacement
CQL	XDCC Catcher Saved Queue List (SiHiDa and balduz (Developers))
CQQ	Cool Quiz
CQS	CADfix Quality Standard (ITI TranscenData)
CQZ	Cool Quiz
CR	Crack File
CR	CRiSP Source Code
CR	Iris Printer CT Format Bitmap
CR$	BASIC VB Kartei File
CR2	Canon Digital Camera Raw Image Format (Canon, Inc.)
CR2	Curious Labs Poser Character File
CR4	STABCAL (stability calculation for aqueous systems) File
CR5	Tripod Data Systmes Survey Pro Coordinate File
CR7	STABCAL (stability calculation for aqueous systems) File
CRA	Advanced Crack File (usually text)
CRA	Personal Craft Factory File
CRACK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRACKING	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRACKPOTY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRACKZBYMAB	YaHoE File
CRAM	Compressed ROM File System File
CRASH	OS X Crash Reporter Crash Report (Apple Inc.)
CRASH2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRATE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRAW	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRAZE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRAZY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRB	BigOven Recipe Database (Lakefront Software, Inc.)
CRC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRC	Pro/ENGINEER Temporary File (PTC)
CRC	JPEG Sheriff CRC Info File (engineering bureau Office Automation)
CRC	Total Commander CRC File (Christian Ghisler, C. Ghisler & Co.)
CRC16	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRD	Guitar Chord File
CRD	Windows Cardfile
CRD	ColdRED Script File
CRD	Spanish Whiz Card Game Sound File (GB Blanchard)
CRDEL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRE	LiveUpdate Crescendo Catapult File
CRE	Infinity Game Engine Monster Description (BioWare Corp.)
CREATOR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CREDITS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CREG	CrazayReg Database (Crazy-Team)
CRF	Sierra Print Artist Craft
CRF	Programming Cross-reference
CRF	OM2Cipher Recipient File
CRF	System Shock 2 Archive
CRF	MASM Cross-Reference File
CRF	Database Cross-Reference File
CRF	Calcomp Raster Bitmap
CRF	CHARTrunner Chart Definition (PQ Systems)
CRF	Thief 2: The Metal Age Archive
CRF	Thief: The Dark Project Archive
CRF	Zortech C++ Cross-Reference File
CRG	Calamus Graphic (invers Software)
CRH	EBwin Estudio Basico de Seguridad y Salud Health and Safety Project Information (Procedimientos-Uno, S.L.)
CRH	Golf Image File (Microsoft Corporation)
CRH	Links Games Course File
CRK	Crack File
CRL	Certificate Revocation List
CRLD	Clicker Crick Resource Library Data File (Crick Software Ltd.)
CRM	CHARTrunner Multi-Chart Definition (PQ Systems)
CRM	Netmino File
CRM	Capital Research Vendor Bid System
CRO	Webalizer.01 Lang File
CRONTAB	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CROPS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CROSS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CROWN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRP	dBASE Encrypted Database
CRP	Visual dBASE Custom Report
CRP	MSI SecureDoc Encrypted File (Micro-Star Int'l Co.,Ltd.)
CRP	Corel Presents Run-Time Presentation
CRS	WordPerfect 5.1 for Windows File Conversion Resource (Corel Corporation)
CRS	Gold Game Course File
CRS	Links Games Course File
CRS	Dance With Intensity
CRS	StepMania Course (StepMania Development Team)
CRT	UNIX Crontab File
CRT	GlobalSign Certificate File
CRT	Soft Concert Karaoke File
CRT	Oracle Terminal Settings Info
CRT	X.509v3 Security Certificate
CRT	C64 Cartridge Image
CRU	CRUSH Compressed Archive
CRUNCH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRUNCHER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRV	Daqarta Extended Audio Data (Interstellar Research)
CRV	Corel Graphics Ver. 10 Custom Gradients File (Corel)
CRW	Crossword Genius
CRW	Cadrail Train Terrain Layout (Sandia Software)
CRW	CHARTrunner Workspace Definition (PQ Systems)
CRW	Canon Digital Camera Raw Image Format (Canon, Inc.)
CRX	Google Chrome Plugin/Extension File (Google)
CRX	Links Games Course File
CRY	CryEngine Sandbox Editor 2 Level Information File (CRYTEK)
CRY	Crypto Chat II Encrypted Notebook-content
CRY	Cypherix/Cryptainer Encrypted Volume File Format (Cypherix)
CRYPTOMITE	CryptoMite Encrypted Archive (BAxBEx Software)
CRYPTX	Cryptx Encrypted File ((CSI) Centro Studi Informatica di Danilo Priore)
CRYSTALHAMMERREMIX	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CRZ	FScruiser Cruise Record (USDA Forest Service)
CRZ	Links Games Course File
CS	Caditor Document (Caglow)
CS	CLEO 3 Custom Script (Seemann)
CS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CS	Fractal Lab Data/Parameter File (Mystic Fractal)
CS	Visual C#.NET Source Code (Microsoft Corporation)
CS	Tribes 2 Scripting File (Sierra)
CS	Torque Game Engine Script (GarageGames)
CS-CNF	Currency Server Software Configuration (Cloanto Corporation)
CS1	CaptureShop 1-Shot Image (Sinar)
CS3	Casio WK-1800 Keyboard Output File (Casio Computer Co., Ltd.)
CS4	CaptureShop 4-Shot Image (Sinar)
CSA	Ultimate Ride Roller Coaster
CSA	Comma Deliminated Text
CSA	InterComm ASCII Sheet File
CSB	Pci Ncr3030 Ncrflash File
CSB	Corel Photo-Paint Script (Corel)
CSB	CircuitSoft Viewer
CSC	Corel Script (Corel)
CSC	Wizard
CSC	CrystalControl LCD Control Software Screen (Crystalfontz)
CSD	EasyLink Measurement Database (Damalini AB)
CSD	Embroidery Design File
CSD	Chemsoft MSDS Database File
CSD	Bitstream Fontware
CSD	Csound Unified File Format for Orchestras and Scores (Dr. Richard Boulanger)
CSD	Canon Camera Configuration File (Canon, Inc.)
CSD	CHI-LLC Storage Designer Design (Computer Human Interaction, LLC)
CSE	Cardinal Studio Template File
CSE	GPS Pathfinder Office Coordinate System (Trinble Navigation Limited)
CSF	[Unknown]
CSF	Brava Reader Content Sealed Format (Informative Graphics Corp)
CSF	Van Dyke's CRT/SecureCRT Script File
CSF	Uefa Champions League Logis Cutscene File
CSF	Acrobat Color Setting (Adobe Systems Incorporated)
CSF	GeoMedia Coordinate System File
CSF	Photoshop Color Settings (Adobe Systems Incorporated)
CSFDB	Open CASCADE 3D Model File (Open CASCADE Company)
CSG	Statistica Graph File
CSH	csh Script
CSH	Photoshop Custom Shape (Adobe Systems Incorporated)
CSH	UNIX csh Shell Script
CSH	CARA-Script-Interpreter-Engine Script
CSH	Hamilton Labs C Shell Script File
CSH	Cubase Offline Processing Information (Steinberg Media Technologies GmbH.)
CSHRC	UNIX C Shell Environment File
CSI	Cyberautograph Signed Item
CSK	StoryWeaver Template (Storymind Store)
CSK	Copernic 2001 Skin (Copernic)
CSK	Claris Works
CSL	Designer Symbol Library (Corel)
CSL	Citation Style Language
CSL	AOL Modem Script (America Online, Inc.)
CSL	TestQuest Pro Test Script (TestQuest, Inc.)
CSLM	Zeiss CSLM Bitmap
CSM	COOLSoft Model Database (Wright Williams & Kelly, Inc.)
CSM	CASL Compiled PalmPilot Program (Feras Information Technologies)
CSM	Chemical Style Markup Language
CSM	Kodak DC265 Camera Script
CSM	C++ Ver. 4.5 Precompiled Header (Borland Software Corporation)
CSM	C++ Symbol File (Borland Software Corporation)
CSML	Chemical Style Markup Language
CSN	CopyMate Raw Points Cloud (GraphiTech Ltd.)
CSN	Dreamweaver MX's Snippet
CSO	CISO Compressed ISO CD Image
CSP	CaseWare Working Papers Script Page
CSP	Cardinal Studio Project File
CSP	Crystal Enterprise Crystal Server Page
CSP	Draw Service Bureau Profiler (Corel)
CSP	Intersystems Caché Server Page File
CSP	PC Emcee On-Screen Image
CSP	CASLwin Program (Feras Information Technologies)
CSP	ChaoSynth Parameter File (Nyrsound)
CSP	AudioZip Encoded Audio
CSPROJ	Visual Studio .NET C# Project (Microsoft Corporation)
CSQ	Foxpro Query (Microsoft Corporation)
CSR	Fast SMS Set SMS Relay Configuration (Comat AG)
CSS	InterComm Part Body Definition
CSS	Citadel SafStor User Script File
CSS	Hypertext Cascading Style Sheet
CSS	Statistica Datasheet
CSS	Stats+ Datafile
CSS1	Cascading Style Sheet See .CSS.
CST	CHARTrunner Chart Style Definition (PQ Systems)
CST	Medbasin Model Calibration File (National Technical University of Athens, Laboratory of Reclamation Works & Water Resources Management)
CST	Macromedia Director Cast File
CST	Technics Sx KN 6000 Keyboard Custom Style File
CSV	Boso View Express Railway and Structure File (Mackoy)
CSV	CompuShow Adjusted EGA/VGA Palette
CSV	Comma-Separated Variables
CSVENX	egis Encrypted CSV File (HiTRUST Inc.)
CSW	WordPerfect Setup Info File (Corel Corporation)
CSW	Compressed Square Wave
CSX	Visual C#.NET Primary Script File (Microsoft Corporation)
CSY	EPOC Polymorphic DLL
CS_	Creativ Compressed Sb16 Sbide File
CT	Iris CT Graphic
CT	Scitex CT Handshake Continuous-Tone Bitmap
CT	Continuout Tone TIFF Bitmap
CT	Cheat Engine Cheat Table (Dream.media)
CT	CTwin Project Data (Procedimientos-Uno, S.L.)
CT0	Maxagrid CTM File Being Processed
CT0	Systems Management Server (SMS) Master Site Control File (Microsoft Corporation)
CT1	Systems Management Server (SMS) Proposed Site Control File (Microsoft Corporation)
CT1	Maxagrid CTM File Successfully Processed
CT2	CTRAN/W Graphical Layout File (Geo-Slope International)
CT2	Maxagrid CTM File Unsuccessfully Processed
CT3	CaseMap Version 3.x Case Analysis Template File (LexisNexis)
CT3	Systems Management Server (SMS) Proposed Site Control File (Microsoft Corporation)
CT3	CTRAN/W Sketch Lines and Text File (Geo-Slope International)
CT4	CaseMap Version 4.x Case Analysis Template File (LexisNexis)
CT5	CaseMap Version 5.x Case Analysis Template File (LexisNexis)
CT6	CaseMap Version 6.x Case Analysis Template File (LexisNexis)
CT7	CaseMap Version 7.x Case Analysis Template File (LexisNexis)
CTAB	CACTVS Chemical Table Format
CTB	Custody Toolbox Data File (Five O'clock Software)
CTB	NoteTab Clipbar
CTB	AutoCAD Color-dependent Plot Style Table (Autodesk, Inc.)
CTC	SeeYou Flight Data (Naviter)
CTC	PC Installer Control
CTD	Simpsons Cartoon Studio Export File
CTD	Marine Data File
CTD	Cardtable File
CTD	Cobra Track Dump
CTD	Click to DVD Project (Sony Corporation of America)
CTE	Classical Text Editor Document (Stefan Hagel, Vienna)
CTF	TIFF Compressed File
CTF	CoffeeCup HTML Editor Table File (CoffeeCup Software, Inc.)
CTF	AVG Update Control File (AVG Technologies)
CTF	Calculator Text Format
CTF	PhotoSuite Album File (Sonic Solutions)
CTF	Casio Text File (Casio Computer Co., Ltd.)
CTF	HP-95LX Character Translation File for Datacomm
CTF	BrightStor ARCserve Backup Backup File (Computer Associates International, Inc.)
CTF	Symphony Character Code Translation (IBM)
CTF	WhereIsIt Catalog
CTFSYS	OS X Mach Kernel System File (Apple Inc.)
CTG	BMC Software Patrol File
CTG	Powershot Pro 70 Info File (Canon, Inc.)
CTG	ChessBase Opening Book
CTG	Cartridge Definition File
CTI	Collectorz.com Template Info File (Bitz & Pixelz)
CTK	mSuite License File (CommonTime Limited)
CTL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CTL	EditPlus Cliptext File (ES-Computing)
CTL	User Control
CTL	Notes 5 Thesaurus (IBM)
CTL	Visual Basic User-defined Control (Microsoft Corporation)
CTL	PDP-10 Batch Control File
CTL	Setup Information
CTM	Java Charge Transaction Matrix File
CTM	FreeBSD Content Management File
CTM	Content Delivery Service
CTM	Maxagrid CTM File
CTM	SDR99 Speech Recognition Task Time Marked Conversation Input
CTM	Crazytalk Talking Animation File
CTM	CGMetafile
CTM	Crazy Talk Face Model File (Reallusion Inc.)
CTM	OpenCTM Compressed Triangle Mesh File (Marcus Geelnard)
CTN	CADTERNS Sloper File (CADTERNS Custom Clothing Inc.)
CTP	ChemDraw Template
CTP	CakePHP View template (CakePHP)
CTP	American Greetings CreataCard (Broderbund)
CTP	BestAddress HTML Editor Combined Template File (Multimedia Australia Pty. Ltd.)
CTR	CATALYST Text Parsing Rules File (Alchemy Software Development Ltd.)
CTR	The Cookie Counter! Hit Count File (CLIQ Services Coop)
CTR	ERGO Receiver Configuration File (Creative Express Corporation)
CTR	Counter File
CTR	CTRAN/W DEFINE Data File (Geo-Slope International)
CTR	Corel40 Trace File
CTRL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CTS	ABC Programming Language Permanent Location Contents
CTS	Crazy Talk Audio File (Reallusion Inc.)
CTS	ClipTrakker Clipboard Collection (SoftwareOnline)
CTT	LabVIEW File
CTT	CAIL Suite Terminal Emulation Data (CAIL Systems Inc.)
CTT	MSN Messenger Saved Contact List (MSN)
CTV	Citavi Project (Academic Software Zurich GmbH)
CTW	Context Tree Weighting Compressed File (Eindhoven University of Technology)
CTX	Chinese Character Input File
CTX	CTRAN/W DEFINE Compressed Data File (Geo-Slope International)
CTX	Gasteiger Group CTX Chemical File
CTX	Windows Terminal Server INI Backup File (Microsoft Corporation)
CTX	GE Industrial Systems CIMPLICITY Text Version HMI Screen
CTX	Visual Basic User Control Binary File
CTX	Compressed Text
CTX	Nokia PC Suite Backup Contact File (Nokia)
CTX	Alphacam Compiled Text (Planit)
CTX	Online Course Text (Microsoft Corporation)
CTX	Pretty Good Privacy (PGP) Ciphertext File (PGP Corporation)
CTY	Railroad Tycoon 3 Cargo (PopTop Software Inc.)
CTY	Fog Creek CityDesk Template
CTY	SimCity City File (Electronic Arts, Inc.)
CTZ	Custody Toolbox Compressed Backup File (Five O'clock Software)
CU1	Photoline4 Curves Curve File
CU3	Photoline4 Curves Clut File
CUB	MDL Molfile Gaussian Cube (Wavefunction) Format (MDL Information Systems, Inc.)
CUB	Cubloc Studio PLC Information File (Comfile Technology Inc.)
CUB	PowerPlay File (Cognos Incorporated)
CUB	SeeYou Airspace (Naviter)
CUB	OLAP Cube File (Microsoft Corporation)
CUBE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CUBE	Cubicomp PictureMaker Bitmap
CUBE	Gaussian Cube File
CUBI	Cubicomp PictureMaker Bitmap
CUC	SeeYou Contest File (Naviter)
CUE	CUEcards 2000 Database (Marcus Humann)
CUE	Cue Cards Data (Microsoft Corporation)
CUE	CDRWin and Others Description File for a CD-Image
CUE	BPM Studio Cue Points (ALCATech)
CUF	Turbo C Utilities Form Definition (Borland Software Corporation)
CUL	Cubloc Studio PLC Information File (Comfile Technology Inc.)
CUL	IconForge/ImageForge Cursor Library
CUP	Roland Garros Tennis Terrain File
CUP	OzWin CompuServe E-mail/Forum Access Catalog Library Update
CUP	SeeYou Waypoint (Naviter)
CUR	Windows Cursor (Microsoft Corporation)
CUREXSCHEME	CursorXP Theme (Stardock Corporation, Inc.)
CURL	URL Links Curl
CURSOR	Sun Icon/Cursor
CURSOR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CURV	Genetica Mathematical Curve (Spiral Graphics Inc.)
CURVE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CURXPTHEME	CursorXP Theme (Stardock Corporation, Inc.)
CUS	ConciseURI Syntax (Clear Methods, Inc.)
CUS	AutoCAD Custom Dictionary (Autodesk, Inc.)
CUS	Payroll Mate 2008 Customer Data (RealTaxTools.com)
CUS	Medlin Accounting Customer Data (Medlin Accounting)
CUSTOM	Personal Paint Custom Language User Interface File (Amiga)
CUT	DataWave Physiological Data File
CUT	Dr. Halo Bitmap Graphic
CUT	INMOS Transputer Development System Occam Utility Package
CUT	Utilitaires
CUT	CLAN Disambiguation Rules (Child Language Data Exchange System)
CUT	BPM Studio Cue Points and Marker Information (ALCATech)
CUTLIST	Asfbin Assistant Cut Data
CUZ	CropWalker
CU_	Winhelp Compressed File
CV	CodeView Information (Microsoft Corporation)
CV	Versions Archive (Corel)
CV3	Civilization III Game High Score (Firaxis Games, Inc.)
CV4	CodeView Colors (Microsoft Corporation)
CV5	Canvas Version 5
CV5	CCS-lib.2 JPEG Stream File
CVA	Compaq Diagnostics (Hewlett-Packard Development Company, L.P.)
CVB	Borland BDE File (Borland Software Corporation)
CVD	Clam AntiVirus Database (Clam AntiVirus Team)
CVD	Calamus Vector Graphic (invers Software)
CVD	Yamaha Custom Drums (Yamaha Corporation of America)
CVD	ClamWin AntiVirus Database (Clam AntiVirus Team)
CVD	CVTracker Dictionary File (Netmap Software Inc.)
CVF	SuperStor Compressed Volume
CVF	Train Simulator Cab View File (Microsoft Corporation)
CVF	Jet-VoiceMail Audio Data (COWON America, Inc.)
CVG	CVTracker Personal Goal File (Netmap Software Inc.)
CVG	Calamus Vector Graphic (invers Software)
CVH	Sound File
CVH	CVTracker Proprietary Help File (Netmap Software Inc.)
CVIP	CVIPlab File
CVJ	Cabinet Vision Solid Job Document (Planit Solutions, Inc.)
CVL	VLBI and Tied Array Cover Letter Tasking Document
CVL	Coastal Vector List Text Format
CVN	Yamaha Custom Voices (Yamaha Corporation of America)
CVP	Kodak File
CVP	WinFax Cover Page (Symantec Corporation)
CVP	Portrait
CVQ	Coastal Vector List Compressed Format
CVR	Bitware Fax File
CVR	ElectraSoft Fax Cover Sheet
CVR	WinFax Cover Page (Symantec Corporation)
CVS	Canvas Drawing File
CVS	Outlook Express File
CVS	Sound File
CVSAUTO	Call Management System (CMS) Automatic Script (Avaya Inc.)
CVSIGNORE	Snort File
CVT	Convert Data File (Joshua F. Madison)
CVT	dBASE Converted Database Backup
CVT	CVTracker Position and Company Template File (Netmap Software Inc.)
CVT	Follett Conversion Tool
CVW	Analytics Cube Report (Actuate Corporation)
CVW	CodeView Colors (Microsoft Corporation)
CVW	Giza Specifier Carera View (20-20 Technologies)
CVX	Canvas Versions 6, 7, 8, 9 Graphic File (ACD Systems Ltd.)
CW	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CW	CodeWallet Pro Secure Database (Developer One, Inc.)
CW2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CW3	Claris Works Win 3 Document
CW3	Chem Draw Molecular Structure
CW3	Crossword Construction Kit Puzzle Group
CW6	COMPRESS Windows Version Pressure Vessel Data File (Codeware Inc.)
CWA	See .CLC
CWA	Castelware Inventory Hardware/Software Audit File (Castelware GmbH)
CWB	WebNote Document
CWC	CADfix Wizard Configuration File (ITI TranscenData)
CWD	StarDraft CWAD File
CWD	Cardwar Card Deck (Stefan Sarbok)
CWDOC	CopyWrite Project Document (Bartas Technologies)
CWE	Crossword Express (AUS-PC-SOFT)
CWEB	C Web
CWF	CodeWatch for Windows Workspace File (Liant)
CWG	Castle of the Winds Saved Game
CWK	ClarisWorks Data File (FileMaker, Inc.)
CWK	CattleMax Data File (Cattlesoft, Inc.)
CWK	GCPrevue Work File (Graphicode)
CWL	ClarisWorks Library
CWP	Cakewalk SONAR Audio Project (Cakewalk)
CWPB	CopyWrite Project Binder (Bartas Technologies)
CWR	Wrapcandy Candy Wrapper (Wrapcandy.com)
CWR	Crystal Reports Report (Crystal Decisions)
CWS	combustion Workspace (Discreet)
CWS	Claris Works Template
CWW	Crossword Weaver File
CWZ	CropWalker File
CW_	Corel Graphics Ver. 10 Workspace (Corel)
CX	CodeMapper Script
CX3	click.EXE 3.0 Script File (ASXperts Inc.)
CXB	ComicGuru (Fay Solutions)
CXB	Custody X Change Data File (Custody X Change, Inc.)
CXC	Custody X Change Data File (Custody X Change, Inc.)
CXD	SimplePCI Combined Graphics and Data (Compix Inc., Imaging Systems)
CXE	Common XML Envelope
CXF	Picasa Collage File
CXF	Chemical Abstracts Exchange Format
CXH	Custody X Change Data File (Custody X Change, Inc.)
CXI	COMPAxiON Compressed File (Xitech (Europe))
CXL	Business Integrator Extract Schema (Pervasive Software Inc.)
CXL	ConsoXL Project File (jepib)
CXM	XYZ-Company.com Proprietary File
CXM	QuadColor Color Correction Master
CXO	CXInsight Export File (CodeMatrix Ltd.)
CXP	CX-Programmer PLC Program File (Binary) (Omron Electronics LLC)
CXP	XYZ-Company.com Proprietary File
CXP	Core Media Player XML-based Playlist File (CoreCodec, Inc.)
CXS	ConciseXML Format File (Clear Methods, Inc.)
CXT	Crocodile Technology Circuit (Crocodile Clips Ltd)
CXT	Vegas Jackpot Gold Game Data File
CXT	CX-Programmer PLC Program File (Text) (Omron Electronics LLC)
CXT	Macromedia Director Protected Cast File
CXV	CryptoEx Volume File (Navastream)
CXV	Custody X Change Data File (Custody X Change, Inc.)
CXX	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CXX	Visual C++ Source Code File (Microsoft Corporation)
CXX	Zortech C++ Program
CX_	C Poet Compressed Disk1 File
CY	CCS-lib.2 JPEG-v4 File
CYA	Cyan Color Separation (Adobe Systems Incorporated)
CYC	CYCAS Design Project (Verlag Frese)
CYCLE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
CYG	Pollux Data (CyGem, ltd.)
CYI	Clustify Input File (Hot Neuron LLC.)
CYL	Ribbons Molecular Cylinder
CYM	Callus Game Sound File (Bloodlust Software)
CYN	Cynex Root55 Program Extension
CYO	Clustify Output File Containing Cluster ID (Hot Neuron LLC.)
CYP	FCB Cypher Knot Diagram (International Guild of Knot Tyers)
CYP	Cypherus Encrypted Archive
CYP	Crocodile Physics Simulation File (Crocodile Clips Ltd.)
CYS	Clustify Clustering Summary (Hot Neuron LLC.)
CYT	Crocodile Technology Simulation (Crocodile Clips Ltd.)
CZD	The Crash Zone Drawing (The CAD Zone)
CZE	NHL Ice Hockey 2002 Required File
CZE	Personal Paint Czech Language User Interface File (Amiga)
CZIP	ZipGenius Compressed Archive (M.Dev Software)
CZP	Cloze Pro Archive (Crick Software Ltd.)
CZS	WinEcran screen link (Bruno DENIS)
C_	Winhelp Compressed File
C_M	Eru/erd File
C__	C++ Source; C__ is C++ in Win32
C~G	Windows 3.x System File