List Of All Extensions And Filetypes - M

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 M

Extension	Information
M	Maple Common Binary File (Maplesoft, a Division of Waterloo Maple Inc.)
M	Winamp3 Uncompiled Script
M	Objective-C Source
M	Miranda language Script File
M	MATLAB Function or Script (The MathWorks, Inc.)
M	Mathematica Functions and Commands (Wolfram Research, Inc.)
M	Amiga E Source Module (Wouter van Oortmerssen)
M	Limbo Interface Declaration
M	Desktop Color Separation Specification Magenta Layer
M	Cliq Accessories Datebook Modification File
M	Brief Macro Source
M	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
M$S	MindStor Firmware Update File
M01	MicroStation Modification Resource (Bentley Systems, Incorporated)
M0D	Malete Options (Record 0) File (OpenIsis)
M11	Farallon's MacRecorder Format Sampling Rate 11k
M11	MASS11 Text File
M12	Hydrographs Synthesis Project File
M12	Proprietary Data Format for Interchange of Defense Form Data with Mil-Pac Technology Software Products
M12	S-BASIC File
M12	SHARP MZ-series Emulator File
M14	Steuer2001 File
M15	thinEdge Model (Petr Schreiber)
M15	Apple MPEG-1 Video (Apple Inc.)
M18	Accolade Golf Course File
M1A	Apple MPEG-1/2 Audio (Apple Inc.)
M1A	MPEG-1 Audiostream
M1C	IBM Voice Type Language Newuser File
M1I	IBM Voice Type Language Newuser File
M1PG	iFinish Video Clip (Media 100 Inc.)
M1S	MPEG Media File
M1V	MPEG-1 Video File
M2	Modula 2 Language Source
M21	AXMEDIS MPEG-21 File (AxMediaTech S.R.L.)
M22	Farallon's MacRecorder Format Sampling Rate 22k
M29	Turbo Smetchik (Data Basis)
M2A	Apple MPEG-1/2 Audio (Apple Inc.)
M2A	MPEG-2 Audio
M2C	IBM Voice Type Language Newuser File
M2I	IBM Voice Type Language Newuser File
M2O	Modula Fitted Modula2 File
M2P	MPEG-2 Program Stream Format File
M2S	MPEG-2 Audio and Video
M2TS	Blu-ray BDAV MPEG-2 Transport Stream (Blu-ray Disc Association)
M2V	MPEG-2 Video Only File
M3	Modula 3 Program File
M32	Dr.T MIDI File
M3A	MPEG Archive Enhanced .M3U Playlist File
M3C	IBM Voice Type Language Newuser File
M3D	EverQuest File
M3D	Corel Motion 3D Animation
M3D	3D Animations Macro
M3D	Cossacks Map File (cdv Software Entertainment USA)
M3G	Nokia Phone Screen Saver (Nokia)
M3G	Mobile 3D Graphic
M3I	IBM Voice Type Language Newuser File
M3S	Myst III Exile Saved Game (Cyan Worlds, Inc.)
M3U	MP3 Playlist File
M3U8	MP3 Playlist File (UTF-8)
M3URL	MP3 Playlist File
m4	m4 Macro
M4	Meta4 Source Code (Meta4)
M4A	MPEG-4 Audio Layer
M4B	MPEG-4 Audio Layer Bookmarkable File
M4C	IBM Voice Type Language Newuser File
M4I	IBM Voice Type Language Newuser File
M4P	Protected AAC File (Apple Inc.)
M4R	iPhone Ringtone (Apple Inc.)
M4S	Myst IV: Revelation Saved Game (Cyan Worlds, Inc.)
M4T	Sage Mas 200 Table File (Sage Software)
M4U	Ogg Media Redirector File
M4V	MPEG-4 Video File
M64	Mupen64 Movie Capture
M68	Turbo Pascal DOS File (Borland Software Corporation)
M7	Farallon's MacRecorder Format Sampling Rate 7k
M75	Apple MPEG-1 Video (Apple Inc.)
M7A	Yamaha Synthesizer Internal User Memory File (Yamaha Corporation)
M7A	Mapking Map (Matlas Technologies, Inc)
M8	Grlib Scry PCserv File
M8	Heretic II MipMap
M99	M99 Compression Algorithm Compressed File (Michael Masicalco)
M??	Ingres Modify Table/Index File (Computer Associates International, Inc.)
MA	Homeworld Maya Scene File (Sierra Entertainment, Inc.)
MA	Maya ASCII Scene (Alias Systems, a division of Silicon Graphics Limited)
MA	Diablo II Map File (Blizzard Entertainment)
MA	Mathematica ASCII File (Wolfram Research, Inc.)
MA	hDC Products for MicroApp Executable Files
MA0	Diablo II (Blizzard Entertainment)
MA1	SKY Mobile Phone Icon/Ringtone
MA1	Diablo II (Blizzard Entertainment)
MA2	Diablo II (Blizzard Entertainment)
MA2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MA3	Harvard Graphics Macro (Harvard Graphics)
MA3	Diablo II (Blizzard Entertainment)
MAB	Mozilla (Netscape) Personal Addressbook or Collected Addressbook (Mozilla)
MAC	Macro
MAC	Access Shortcut (Microsoft Corporation)
MAC	MacPaint Bitmap Graphic
MAC	MINITAB Macro (Minitab, Inc.)
MAC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAC	Dynamics GP Macro (Microsoft Corporation)
MAC	Daqarta Extended Audio Data (Interstellar Research)
MAC	TASM Macro (Borland Software Corporation)
MAC	PDP-10 MACRO-10 Assembler Compiler Source
MAC	Geometry II Plus Macro File (Cabrilog)
MAC2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAC3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAC4	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACAPPL	MacDrive (Mediafour Corporation)
MACHACHA	MacHacha Split Control File (Pescados Software)
MACHINE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACHTYPE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACP	MacPaint Bitmap Graphic
MACR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACRO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACRO2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACRO3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACROS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MACWRITE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAD	Game Movie File (Electronic Arts, Inc.)
MAD	Access Module Shortcut (Microsoft Corporation)
MAD	Mlat AdLib Tracker
MAD	Homeworld Model Animation Data (Sierra Entertainment, Inc.)
MADNESS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MADONNA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MADSTATE	Homeworld Model Animation Script (Sierra Entertainment, Inc.)
MADX	fotoFlag Meta Action Definition XML (flagNtag inc.)
MAE	Maestro Molecular Model (Schrödinger, LLC)
MAEGZ	Maestro Compressed Molecular Model (Schrödinger, LLC)
MAF	Access (Microsoft Corporation)
MAFF	Firefox Mozilla Archive Format Extension Saved Web Page Archive (Mozilla)
MAG	MPS Magro Paint System Graphic
MAG	Access Diagram Shortcut (Microsoft Corporation)
MAG	Magic 1 2 3 Acounting File (Universal Systems)
MAG	Magic Mail Monitor Mailbox File
MAG	Magenta Color Separation (Adobe Systems Incorporated)
MAG	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAG	Fortis and File Magic Document File (Westbrook Technologies, Inc.)
MAG	MagIchan Graphic
MAGIC	Magic Mail Monitor Mailbox
MAGICS	Magics Project File (Materialise NV)
MAGNET	Vuze File (Vuze Project Team)
MAGNETICFIELDSIV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAGS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAH	Mahjongg Solitaire Settings
MAHJONGTITANSSAVE-MS	Mahjong Titans Saved Game (Microsoft Corporation)
MAI	MS Mail Message
MAI	Pegasus Mail Message Directory (David Harris)
MAI	VAX Mail
MAI	Sony Video Thumbnail (Sony Corporation of America)
MAIL	NeoPlanet Mail Client
MAIL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAILABVIEW	MSN AddressBook View (Microsoft Corporation)
MAILBOX	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAILHOST	MSN Explorer E-mail Server Preferences File (Microsoft Corporation)
MAILORDER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAILSRV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAILVIEW	MSN Mail Message List (Microsoft Corporation)
MAIN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAJ	Profile Master 2000 Job Data (MAP Ltd.)
MAK	Visual C++ Project (Microsoft Corporation)
MAK	Make File
MAK	Visual Basic Ver. 3.0 Project (Microsoft Corporation)
MAK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAKE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAKE	Makefile
MAKE2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAKEFILE	Makefile
MAKEPP	Makepp Make File (Gary Holt)
MAKER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAKETAIL	Sourcecontrol File
MAKI	Winamp3 Compiled Script (Nullsoft)
MAL	Connect Server Configuration (AvantGo, Inc.)
MAL	Webalizer.01 Language File
MAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MALE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAM	Access Macro Shortcut (Microsoft Corporation)
MAN	Windows 2000 Mandatory User Profile
MAN	Manual
MAN	Blaise File (Statistics Netherlands)
MAN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MANAGER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MANGER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MANIFEST	Windows Visual Stylesheet XML File (Microsoft Corporation)
MANNERLY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MANTECA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MANUAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MANUALS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MANX	Manual File
MAP	3Com Network Supervisor Network Topolgy Map (3Com)
MAP	Diablo II Map (Blizzard Entertainment)
map	UNIX Map File
MAP	Command & Conquer Red Alert 2 Mission File (Westwood Studios)
MAP	Carnivores / Ice Age Map File (Action Forms, Ltd.)
MAP	General Surfing Map
MAP	SpellForce Level Map (JoWooD Productions Software AG)
MAP	OziExplorer Map (Des & Lorraine Newman)
MAP	Pro/ENGINEER (PTC)
MAP	Hex Workshop Hex Editor Character Map (BreakPoint Software, Inc.)
MAP	Offline Explorer (MetaProducts Corporation)
MAP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAP	Imagination Image Map Editor Image Map Coordinates File (Multimedia Australia Pty. Ltd.)
MAP	MapInfo Map (MapInfo Corporation)
MAP	Debug Info Used by Some Programming Languages
MAP	WorldCraft Quake/Half-Life Game Level File
MAP	Geography Maps
MAP	Ingres Termcap Mapping File (Computer Associates International, Inc.)
MAP	Visual Studio .NET 2002 Linker Map (Microsoft Corporation)
MAP	Manifold Map
MAP	MAPIMail
MAP	Micrografx Picture Publisher Format Data
MAP	Poser 3D Map File
MAP	PROGNOSIS Map Document File
MAP	Server-side Image Map
MAP	Fenix Map
MAP	AccView Network Map
MAP	Image
MAP	Atlas MapMaker Map
MAP	Blood Game File Map
MAP	Route 66 Card Document
MAP	Color Palette
MAP	ColorMAP Intensities and Indices Color Palette
MAP	DIV Game Studio Map
MAP	Duke Nukem Game Level Data File
MAP2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAPF	MainActor Project (MainConcept AG)
MAPIMAIL	Outlook Express Mail File (Microsoft Corporation)
MAPIMAIL	Mail SentTo Drop (Microsoft Corporation)
MAPISEND	MAPISEND File (Microsoft Corporation)
MAPLET	Maplet Design File (Blitz Research Ltd.)
MAPS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAPSAO	Aleph One Maps (Marathon Open Source)
MAPX	MapDotNet Map Definition File (I.S. Consulting, Inc.)
MAQ	Access Query Shortcut (Microsoft Corporation)
MAR	WebSphere Business Modeler Process Model Template (International Business Machines Corp.)
MAR	MSN Archive (Microsoft Corporation)
MAR	Access Report Shortcut (Microsoft Corporation)
MAR	Micrognosis Micrognosis Compressed Archive File
MAR	Bibliographic Data Format
MAR	Mar Compressed Archive
MAR	VAX Macro Assembly Program
MAR	Pegasus Mail Attributes Records Per User (David Harris)
MAR	Mozilla Archive (Mozilla)
MAR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MARCH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MARIMBA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MARIO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MARK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MARKE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MARKER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MARM	EPOC Makefile for MARM Platform
MAS	Nascar SimRacing Data
MAS	WebFOCUS / FOCUS / Web390 MASter File Description (MFD) (Information Builders)
MAS	QuickCard File
MAS	Make A Storybook Storybook (Kennard Consulting)
MAS	Freelance Graphics Smartmaster File (IBM)
MAS	Focus Master Data Definition
MAS	Access Stored Procedures (Microsoft Corporation)
MASCOT	Otaku Mascot Mascot (Accursed Toys Inc.)
MASK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MASKA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MASON	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MASS	Mass Downloader Partial Download (MetaProducts Corporation)
MASSAGESOAPBOOK	WinCity Massage SOAP Notes Soap Book (WinCity Custom Software, Inc.)
MASTER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MASTERANDSERVANT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAT	Vue Materials (e-on software, inc.)
MAT	RCSWin Material File (RCS Corporation)
MAT	MATLAB Variables Binary File (The MathWorks, Inc.)
MAT	Freelancer Model Textures File (Microsoft Corporation)
MAT	Access Table Shortcut (Microsoft Corporation)
MAT	CRiSP Harvest File
MAT	3D Studio Material Library (Autodesk, Inc.)
MAT	Sound File
MAT	Pro/ENGINEER Material Properties File (PTC)
MAT	Animation:Master Material (Hash)
MAT	ArcView Geocoding Matching Parameters File (ESRI)
MAT	Poser 3D Pose File
MAT	Ox Object-Oriented Matrix Programming Language Matrix File
MATH	AnalyticMath (Paul Hunter)
MATH	Amaya
MATH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MATHCALC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MATILDA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAUC	Multi-Channel Server (MCS) Component Policy Editor Audio Component (Volantis Systems Ltd.)
MAUD	Sound File
MAV	Access View Shortcut (Microsoft Corporation)
MAW	Access Data Access Page (Microsoft Corporation)
MAX	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAX	OrCAD Layout File (Cadence Design Systems, Inc.)
MAX	3ds Max Studio Max Scene (Autodesk, Inc.)
MAX	PS2 Powersave File
MAX	CryptoMailer Encrypted File (TheGreenBow)
MAX	PaperPort Scanned Image (ScanSoft Inc.)
MAX	OmniPage Image (Nuance Communications, Inc.)
MAX	3D Studio Scene (Autodesk, Inc.)
MAX	Creative Writer Document (Microsoft Corporation)
MAX	Maximizer Contact & E-business Program
MAX	Max Source Code
MAXA	Maxa Crypt Mobile Encrypted File (MAXA Research Int'l Inc.)
MAYBE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MAZ	3ds Max Archived Network Rendering Job (Autodesk, Inc.)
MAZ	Division's dVS/dVISE File
MAZ	Hover Maze Data
MAZE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MB	Mathematica Binary File (Wolfram Research, Inc.)
MB	MapBasic Program (MapInfo Corporation)
MB	Paradox Memo Holder
MB	Maya Binary Scene (Alias Systems, a division of Silicon Graphics Limited)
MB1	Apogee Monster Bash Data
MB4	Model Builder Model Design File (Evan Designs)
MBA	Martus Human Rights Bulletin System (Benetech)
MBB	MannaBook (MannaBook Software, Inc.)
MBD	Revolution EDX Catalog (4pi Analysis, Inc.)
MBD	Multimedia Builder MP3 Authoring File (Mediachance.com)
MBD	Multimedia Builder Data (as-master)
MBF	Money Backup File (Microsoft Corporation)
MBF	Corel Visual DTD Document Type Definition for SGML (Corel Corporation)
MBFAVS	Stardent AVS X Image
MBFS	Stardent AVS X Image
MBG	Mailbag Assistant E-mail Archive
MBG	MS Mail Mailbag
MBI	MBasic Source Code
MBK	VersaPro Motion Block Backup
MBK	dBASE IV Multiple Index Backup
MBK	Atari (Atari)
MBL	Multi-Batch Batch Listing (Engineering Graphics (nsw) pty. Ltd)
MBL	Logger Pro Experiment Data File (Vernier Software & Technology)
MBM	SymbianOS Multi BitMap Image
MBN	Sony Ericsson Mainware File (Sony Ericsson Mobile Communications AB)
MBOX	Unix Mbox Format Mail File
MBP	Mobipocket eBook Auxiliary File (Amazon.com, Inc.)
MBP	Medbasin Project File (National Technical University of Athens, Laboratory of Reclamation Works & Water Resources Management)
MBP	Balder Multiboot Project (HCData)
MBP	Mediabase Package (Digilink B.V.)
MBR	AS/400 Physical File Member (IBM)
MBS	Mailbag Assistant Script
MBS	Micrografx Picture Publisher Brush Shape
MBS	Opera Mailbox File (Opera Software ASA)
MBSA	Microsoft Baseline Security Analyzer Report (Microsoft Corporation)
MBT	ecBuilder Template
MBT	HASLEMERE / Other MBT Applications MBT Data File (Modern Business Technology Limited)
MBTN	Multi-Channel Server (MCS) Component Policy Editor Button Image Component (Volantis Systems Ltd.)
MBU	Neverwinter Nights Music File
MBV	Corel.visualDTD.7
MBW	MarketBrowser
MBX	Database Index; dBASE Index
MBX	Mailbox Message File
MBX	MapBasic Compiled Program (MapInfo Corporation)
MC	Modula-3 M3CG intermediate Language File
MC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MC	Bricolage Page Template (Bricolage Development Team)
MC	Windows Localized Message Table Resource
MC	NRC Inspection Manual Chapter
MC	MetaCard Script
MC	PlaySaver and PSEmuPro Memory Card Save and Single Game Save
MC$	Magic Xchange Package
MC1	MedCalc Data File
MC2	Mastercook File (Sierra)
MC3	Bridge Design Modeler 3D Match-Casting Geometry Control
MC3E	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MC4	MicroCase Data File (Cengage Learning)
MC4D	Cinema 4D v4.x Object (MAXON Computer GmbH)
MC5	Grafic Jpg Bcc file/microsoft C v5 related file
MC6	C File/Makefile (Microsoft Corporation)
MC7	Mastercam 7 File (CNC Software, Inc.)
MC8	Mastercam 8 File (CNC Software, Inc.)
MC9	Mastercam 9 File (CNC Software, Inc.)
MCA	HFS Medicare Auditor Medicare Cost Audit (Health Financial Systems)
MCA	ModCA IOCA
MCA	i-deas Web ACCESS File
MCB	Grlib Ravekit File
MCB	NEPLAN Project File (BCP Busarello + Cott + Partner Inc.)
MCB	Merak Email Server Configuration Backup (IceWarp Ltd.)
MCC	MathCAD Configuration (Mathsoft Engineering & Education Inc.)
MCC	Incite Media Assistant File
MCC	Dialer10 Calling Card
MCC	Monu-Cad Pro CAD File
MCC	Mylar City Character Editor
MCC	VectorWorks/MiniCAD File
MCC	The Microsoft Network Shortcut (Microsoft Corporation)
MCC	Amiga MUI External Class/Library (SASG)
MCD	MinCAD 7 Drawing/Texture (Nemetschek North America Inc.)
MCD	VectorWorks Drawing (Nemetschek)
MCD	MediaCD Configuration File (Bot Productions)
MCD	Craig McDowall.com NotePad
MCD	Bleem! Memory Card Save
MCD	MathCaD Document (Mathsoft Engineering & Education Inc.)
MCD	Monu-Cad Pro CAD File
MCF	Hotsauce Graphics
MCF	Media Container Format
MCF	Master Command File
MCF	MathCAD Font (Mathsoft Engineering & Education Inc.)
MCF	Meta Content Format File
MCF	MMS Composer File
MCF	MAX II Configuration File (Max B.V.)
MCF	SignIQ Media Collection File (ImpulseLogic)
MCF	TMPGEnc Conversion Template (Pegays Inc.)
MCF	Public Browser Platform Configuration File (Myriad Communications Ltd)
MCF	Mastercook Cookbook File (Sierra Entertainment, Inc.)
MCH	Xtra Cache File (Macromedia)
MCHT	Multi-Channel Server (MCS) Component Policy Editor Chart Component (Volantis Systems Ltd.)
MCI	Media Control Interface Command Set
MCIF	MacroMolecular Crystallographic Information File
MCL	MultiEdit Macro Library
MCL	Multimedia Manager Collection File
MCL	MUSHclient World Information File
MCL	Macro Command Language
MCL	MCell Cellular Automaton Ffile (Mirek Wojtowicz (Miroslaw Wójtowicz))
MCL	VectorWorks Template (Nemetschek)
MCL	Windows Media Center Application Link (Microsoft Corporation)
MCM	Enable Macro
MCM	MacMolecule File
MCO	MSN Messenger Wink File (MSN)
MCP	MUSICompress Encoded Audio (Soundspace Audio LLC)
MCP	NetMC Player Composed Media Multimedia File
MCP	MathCAD Printer Driver (Mathsoft Engineering & Education Inc.)
MCP	Master Compiler Profile
MCP	Amiga MUI Preference Class/Library (SASG)
MCP	Capsule Application Script
MCP	WaveZIP Lossless Compressed Audio
MCP	MSN Content Plus Installer File Archive (MSN Content Plus Inc.)
MCP	CodeWarrior Project (Freescale Semiconductor, Inc.)
MCQ	McAfee Quarantined File
MCR	CuteFTP Script (GlobalSCAPE)
MCR	PlaySaver and PSEmuPro Memory Card Save and Single Game Save
MCR	Perfect Keyboard Macro (Pitrinec Software)
MCR	Macro Magic Macro (iolo technologies, LLC.)
MCR	DataCAD Keyboard Macro File (DATACAD LLC)
MCR	Generic CADD Macro
MCR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MCR	Freemagic Source Imageanalysis File
MCR	BricsCad Macro (BricsCad nv)
MCR	HFS Medicare Auditor Medicare Cost Report (Health Financial Systems)
MCR3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MCR3E	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MCRE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MCS	Mimics Project File (Materialise NV)
MCS	VirusScan TC Installation File (Network Associates)
MCS	The Only Sheet [TOS] Data File (Richard Taillon)
MCS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MCS	HalfLife MapCycle - Editor
MCS	MathCAD Format File (Mathsoft Engineering & Education Inc.)
MCT	MSN Messenger Packaged Wink File (MSN)
MCT	MapChart Genetic Map Data (Plant Research International)
MCT	Musicator
MCW	MacWrite II Macintosh Text File
MCW	Word for Macintosh Document (Microsoft Corporation)
MCX	Intel Connection Fax File
MCX	Mastercam Computer Aided Machining Design File (CNC Software, Inc.)
MCX	Mastercook File (Sierra)
MCX	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MCX	MacroX Macro File (Millsoft Software Development)
MC_	Musicato Compressed File
MD	Technics Keyboard User MIDI Settings File
MD	Mungyodance Data Pack (Empathetic Enteprises)
MD	Mayura Draw Vector Drawing File (Mayura Software)
MD	MDCD Compressed Archive File
MD	Chaos Desktop Metadata File (Chaos systems AB)
MD	Teknical eLearning Objects Meta-Data File (Teknical Ltd.)
MD1	Gear CD Suite File
MD2	Quake 2 Player Model
MD3	Quake III Arena Model File (ID Software)
MD5	IsoBuster MD5 Checksum (Smart Projects)
MD5	Checksum File for .SHN Audio
MD5	ExactFile MD5 Checksum Digest File (StudyLamp Software LLC.)
MD5	MD5summer Checksum
MD5	fsum MD5 Checksum File (SlavaSoft Inc.)
MD8	Mediator Project (MatchWare)
MD8	CDrom Database File
MDA	MicroDesign Area File (Creative Technology)
MDA	Access 2 Workgroup (Microsoft Corporation)
MDA	Meridian Data Slingshot
MDA	Access Add-in (Microsoft Corporation)
MDA	Rays Media Data
MDB	MS File Viewer
MDB	ProWORX Nxt Memory Data (Schneider Electric)
MDB	PTC Pro/MECHANICA File
MDB	Access Database (Microsoft Corporation)
MDB	Mono Debugging Information (Mono Project)
MDB	Mediator Multimedia Data
MDB	Access Application (Microsoft Corporation)
MDB	NEi Nastran Modal Database (Noran Engineering, Inc.)
MDBACKUP	IPhone Backup File (Apple Inc.)
MDC	MedDC Mail Pouch (Asier Technology Corporation)
MDC	PowerPlay Power Cube (Cognos Incorporated)
MDC	Pfeiffer Quadstar Mass Spectrometer Data (Pfeiffer Vacuum GmbH)
MDD	MacDraft Drawing (Microspot Ltd)
MDD	Database Designer for MySQL Database Diagram (MicroOLAP Technologies LTD)
MDE	Office File (Microsoft Corporation)
MDE	Tonline Database File
MDE	Access MDE Database File (Microsoft Corporation)
MDF	Insight II Molecular Data File (Accelrys Software Inc.)
MDF	Alcohol 120% CD Image File (Alcohol Software)
MDF	Fldigi Macro (Dave Freese, W1HKJ)
MDF	Star Trek Armada Map File Title & Image Information
MDF	ProWORX Nxt Memory Data (Schneider Electric)
MDF	SQL Server Master Database File (Microsoft Corporation)
MDF	Menu Definition File
MDF	I-deas Master Drafting Machine Data File
MDF	Capture Classic Filler (Accelio)
MDF	Vector CANape / CANgraph / CANdito Measurement Data (Vector Informatik GmbH)
MDH	Madhyam Hindi Word Processor File (Balendu Sharma Dadhich)
MDHTML	Access HTML File (Microsoft Corporation)
MDI	Borland Multiple Document Interface (Borland Software Corporation)
MDI	MIDI-sequention Sound
MDI	Office Document Imaging File (Microsoft Corporation)
MDK	Schedule File (Ad Astra)
MDL	Rational Rose Object Design Model (IBM)
MDL	Half-life Model
MDL	CA-Compete! Spreadsheet
MDL	Flight Simulator 3D Model File (Microsoft Corporation)
MDL	MapShots Software
MDL	Moray Wireframe Model (SoftTronics)
MDL	Quake Model File
MDL	Simulink Simulation Model (The MathWorks, Inc.)
MDL	Symbian OS MIME Type Library
MDL	3D GameStudio Model Entity (Conitec Datasystems, Inc)
MDL	RapidForm Proprietary Format (INUS Technology, Inc.)
MDL	ASTi Model Builder
MDL	3D Design Plus Model
MDL	Digitrakker Music Module
MDL	Animation:Master 3D Model (Hash)
MDL	Steam Source SDK Model Content File (Valve Corporation)
MDL	Mighty Draw DOS Library (theliquidateher Software, An MCS Investments, Inc. Company)
MDM	Mario Dash Map File
MDM	Telix Modem Definition
MDM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MDMP	WinXP Trouble Report (Microsoft Corporation)
MDN	Access Blank Database Template (Microsoft Corporation)
MDO	Internet Information Server Configuration Backup (Microsoft Corporation)
MDO	Alcohol 120% Split Image File (Alcohol Software)
MDP	Developer Studio Project (Microsoft Corporation)
MDP	MicroDesign Page File (Creative Technology)
MDP	Visual Studio .NET Project Converter (VC 4.x) (Microsoft Corporation)
MDP	Visual C++ MAK File and Visual J++ Project Workspace (Microsoft Corporation)
MDPR	Multi-Channel Server (MCS) Device Policy Editor Device Profile Repository (Volantis Systems Ltd.)
MDR	MAX II Recovery File (Max B.V.)
MDR	ZX Spectrum-Emulator Microdrive File
MDR	FaxTalk Modem Doctor Modem Report File
MDR	MagicDraw UML Project (No Magic, Inc.)
MDS	SeeYou Raster Map (Naviter)
MDS	Media Descriptor CD Image File
MDS	Directx Mid2stream File
MDT	Access Add-in Data (Microsoft Corporation)
MDT	Ilink Incremental Linker Data Table (Microsoft Corporation)
MDT	NOVA NT-MDT Scanning Probe Microscope Data (NT-MDT)
MDT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MDV	M1 Pattern File (H. Stoll GmbH & Co.)
MDV	QLAY MDV Image
MDW	Access Workgroup Information (Microsoft Corporation)
MDX	dBASE IV Multiple Index
MDX	MDict Dictionary File (Octopus Studio)
MDX	Label Pro Re-Index (Avery)
MDX	MidiEx MIDI System Exclusive Dump
MDX	Rational XDE Model (IBM)
MDX	Borland Database Engine Index (Borland Software Corporation)
MDYV	Multi-Channel Server (MCS) Component Policy Editor Dynamic Visual Component (Volantis Systems Ltd.)
MDZ	Access Wizard Template (Microsoft Corporation)
MDZ	Cubic Player/Cross-View Music Module Description
MDZ	Protracker/Module File
MD_	Visc15 Adressen Setup File
ME	MultiEdit Configuration (Multi Edit Software Incorporated)
ME	Information
me	Nroff Formatted Manual Page with ME Macros
ME	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ME!	Text (Generally a README File)
ME1	Zortech 21 Sample Winexam File
ME2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ME3	Multimedia Email Message (ArcSoft, Inc.)
MEA	Mastersizer 2000 Sample Analysis/Measurement (Malvern Instruments Ltd)
MEA	Meazure File
MEANT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEB	Open eBook (International Digital Publishing Forum)
MEB	WordPerfect Macro Editor Bottom Overflow File (Corel Corporation)
MEC	Maximus MECCA Source
MED	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MED	Amiga MED/OctaMED Tracker Module Sound File
MED	Medline Document
MED	WordPerfect Macro Editor Delete Save (Corel Corporation)
MED	MOBILedit! Phone Information (COMPELSON Laboratories)
MED	A2B Player Purchase (DigitalPhono.com)
MED	Notes 5 Medical Dictionary File (IBM)
MEDIACONTROL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEDIACTRL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEDIAONEPROJECT	MediaOne Project (Corel Corporation)
MEDICAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEDIU	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEDLINE	Medline Document
MEEP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEF	Jaws PDF Server Exported Settings (Global Graphics Software Ltd.)
MEF	MAIET Encrypted File System (MAIET entertainment, Inc.)
MEFP	ExerciseRT Sample Data Record (Morgan Medical Ltd.)
MEFS	ExerciseRT Secondary Data Record (Morgan Medical Ltd.)
MEG	MEG 101 B Database File (MEGBase)
MEGABLASTER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEGAMISQUE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEI	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEK	Gearhead Garage Game File (Mekada)
MEL	Ericsson Phone Melody
MEL	Maya Embedded Language Script (Alias Systems, a division of Silicon Graphics Limited)
MELL	Mellel Document (RedleX)
MEM	FoxPro Memory Variable Save File (Microsoft Corporation)
MEM	Medlin Accounting Additional Vendor Data (Medlin Accounting)
MEM	WordPerfect Macro Editor Macro (Corel Corporation)
MEM	Memory File of Variables
MEM	Context4 File
MEM	BPM Studio Saved Files for Sampler Functions (ALCATech)
MEM	Fanuc Parameter File (FANUC Robotics America, Inc.)
MEM	Clarion DOS Database Memo File (SoftVelocity)
MEM	Mio Technology Mio Object (Mioplanet Technologies, Inc.)
MEM	PDP-10 Memo
MEM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEMB	Pro/ENGINEER Temporary File (PTC)
MEMBERS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEMO	Unknown Found in Multiple GNU/Linux Packages
MEMORY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEN	Menu
MEN	MenuPro Menu Design (SoftCafe)
MEN	Geometry II Plus Utility (Cabrilog)
MENTAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MENU	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MENU1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MENU2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MENUS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MEP	Inor MePro Software File
MEQ	WordPerfect Macro Editor Print Queue (Corel Corporation)
MER	Entity-Relationship (ER) Diagram
MER	Data Interchange Format
MER	WordPerfect Macro Editor Resident Area (Corel Corporation)
MERLIN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MERMACK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MERR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MERRITT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MES	SpectraMagic Data File (Konica Minolta Holdings, Inc.)
MES	WordPerfect Macro Editor Work Space (Corel Corporation)
MES	Message File
MES	A2B Player File (DigitalPhono.com)
MESA	Opengl Glut-3.6 File
MESHWORLD	Hamsterball Level File (Raptisoft, LLC)
MESSAGE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MESSAGES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MESSENGER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MET	Hydrologic Modeling System (HEC-HMS) Metereologic Model Configuration (U.S. Army Corps of Engineers)
MET	eMule Cached Information (eMule Team)
MET	WordPerfect Macro Editor Top Overflow File (Corel Corporation)
MET	Presentation Manager Meta File
MET	OS/2 PM Meta File
MET	OmniPage Document (Nuance Communications, Inc.)
MET	eDonkey Cached Information (MetaMachine)
MET	ActiveSky Export File (HiFi Simulation Software)
META	Black & White Creature Mind Meta Data (Microsoft Corporation)
METAL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
METALFONT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
METALINK	Metalink File (Anthony Bryan)
METHODS	Likely a Text File
MEU	DOS Shell Menus
MEW	MultiEdit Configuration (Multi Edit Software Incorporated)
MEX	mexReader Multimedia File
MEX	MATLAB Macintosh Dynamically Linked Subroutines (The MathWorks, Inc.)
MEX	MATLAB Executable Command (The MathWorks, Inc.)
MEX	WordPerfect Macro Editor Expound File (Corel Corporation)
MEX	Macro Express Macro (Insight Software Solutions)
MEX4	MATLAB Sun-4/SPARC Dynamically Linked Subroutines (The MathWorks, Inc.)
MEXDS	MATLAB DECStation Dynamically Linked Subroutines (The MathWorks, Inc.)
MEXHP3	MATLAB HP9000/Series 300 Dynamically Linked Subroutines (The MathWorks, Inc.)
MEXHP7	MATLAB HP9000/Series 700 Dynamically Linked Subroutines (The MathWorks, Inc.)
MEXN	MATLAB NeXT Dynamically Linked Subroutines (The MathWorks, Inc.)
MEXRS6	MATLAB IBM RS/6000 Dynamically Linked Subroutines (The MathWorks, Inc.)
MEXSG	MATLAB SGI Dynamically Linked Subroutines (The MathWorks, Inc.)
MEY	Notes 5 Full Text Index (IBM)
MEZ	RealArcade Game Information
MEZ	MusicEase Music Notation File (MusicEase Software)
MF	Java Manifest (Sun Microsystems, Inc.)
MF	Manifest Graphic
MF	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
mf	METAFONT Font Description File
MF	FrameMaker MakerFile (Adobe Systems Incorporated)
MF	MoonFish Track File (Bram Bos)
MF2	Authorware Mediator5 Multimedia File (Adobe Systems Incorporated)
MFA	The Games Factory Multimedia Fusion File (Clickteam)
MFA	Site Server 3.0 Report Definition (Microsoft Corporation)
MFASL	Mozilla (Netscape) XUL FastLoad File (Mozilla.org)
MFC	Mankind File
MFD	ABC Programming Language Monadic Function
MFD	F1RC Relay Game Code File
MFD	Adobe Multiple Master Font Metrics Directory File (Adobe Systems Incorporated)
MFD	Multiframe Structural Frame Model (Formation Design Systems Pty Ltd)
MFF	MIDI File Format
MFG	MediaForge Runtime Player Distribution Project (XMLAuthor, Inc.)
MFI	Win98rk File
MFJ	MetaFont Job Batch Input
MFK	Mafuka Audio
MFL	Mozilla (Netscape) XUL FastLoad File (Mozilla)
MFM	VTeX Multiple Master Font Metrics
MFM	mTropolis mPire Interactive Multimedia Title (Quark)
MFM	DMP Music Format
MFMOD	Mobile Forces Game MOD (Rage Software)
MFO	MediaFace Online Saved File (Neato, Inc.)
MFS	MetFS Partition (EnderUNIX)
MFT	MetaFont Source Formatter Style File
MFW	mTropolis mPire Interactive Multimedia Title (Quark)
MFW	Mamiya Camera RAW File (Mamiya)
MFX	mTropolis mPire Interactive Multimedia Title (Quark)
MG	Modula-3 Generic Module Source
MG1	MusiGenesis Project File (Kenneth Adams)
MGA	Migrys IMR Call Flow (Migrys Innovations)
MGC	Equation Editor File (MGCSoft)
MGC	Clipart Collection Catalog (Microsoft Corporation)
MGCF	MagicInstall Compressed File
MGD	Master Grade Gradebook
MGD	Mungyodance Data Pack (Empathetic Enteprises)
MGF	Monarch Graphic File
MGF	Micrografx Font
MGF	MalieGF Bitmap
MGF	Materials and Geometry Format File
MGF	DataModeler XML Schema Project Data (URL Integration, Inc.)
MGK	ImageMagick Ver. 5.3.2 Coders File (ImageMagick Studio LLC)
MGL	Age of Kings (Microsoft Corporation)
MGL	mosascii m2 and MosASCII Graphics Library (Robert DeFusco)
MGM	MGCSoft Equation Editor Macro File
MGMAP	Ygnius MindGenius Mind Map (Ygnius)
MGMF	MindGenius Mind Map (MindGenius Ltd.)
MGN	Modern Genealogy Genealogy Database (Modern Genealogy, LLC)
mgp	MagicPoint File
MGR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MGR	MGR Bitmap
MGRP	Multi-Channel Server (MCS) Component Policy Editor Asset Group (Volantis Systems Ltd.)
MGS	Intelligence Tracking System File
MGTPL	Ygnius MindGenius Template (Ygnius)
MGU	Band-in-a-Box MIDI File (PG Music, Inc.)
MGV	Yamaha Mega Voices (Yamaha Corporation of America)
MGX	Rise of Nations Saved Game (Microsoft Corporation)
MGX	Micrografx Picture Publisher Clipart
MGZ	Metal Gear Solid Archive
MH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MH	Graphic File
MHF	Maestro ERP Hot Fix (Maestro Technologies Inc.)
MHG	Multimedia File
MHK	Broderbund Mohawk Archive
MHK	Riven Movie Data File
MHP	Home Publishing Project (Microsoft Corporation)
MHT	MHTML Document (Microsoft Corporation)
MHTENX	egis Encrypted HTM File (HiTRUST Inc.)
MHTM	MHTML Document (Microsoft Corporation)
MHTML	MHTML Document (Microsoft Corporation)
MHTMLENX	egis Encrypted MHTML File (HiTRUST Inc.)
MI	Miscellaneous
MI	Winamp3 MAKI Scripting Library
MI	CoCreate CAD File
MI	mental ray Scene File (mental images GmbH)
MI4	HDD 100/120 Audio Jukebox Firmware File (Koninklijke Philips Electronics N.V.)
MIA	Babya bMix/Logic Music Project File (Babya Software Group)
MIA	MusicIndiaOnline Trident Player Music File (MusicIndiaOnLine)
MIB	MyInfo Topic File Backup (Milenix Software Ltd.)
MIB	SNMP MIB File
MIB	Management Information Base File
MIBFONT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MIC	PDP-10 Macro Interpreted Commands
MIC	Image Composer File (Microsoft Corporation)
MICE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MID	Musical Instrument Digital Interface MIDI-sequention Sound
MID	MapInfo Interchange Format (MapInfo Corporation)
MIDI	Musical Instrument Digital Interface MIDI-sequention Sound
MIDIFILE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MIDISYNTH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MIDNAM	Pro Tools MIDI Patch Name File (Avid Technology, Inc.)
MIF	EarthLink E-mail Message Index (EarthLink, Inc.)
MIF	Software License Tracking Tool
MIF	MIDI Instrument
MIF	Watcom Make Script
MIF	MicroHof .MIF Assembler File
MIF	MapInfo Interchange Format File (MapInfo Corporation)
MIF	Management Information Format (Distributed Management Task Force, Inc.)
MIF	ImageMagick Machine Independent File Format Bitmap (ImageMagick Studio LLC)
MIF	FrameMaker Interchange Format (Adobe Systems Incorporated)
MIF	Molecular Information Format
MIF	Systems Management Server (SMS) Management Information Format (Microsoft Corporation)
MIFF	ImageMagick Machine Independent File Format Bitmap (ImageMagick Studio LLC)
MIG	Mighty Draw Drawing (theliquidateher Software, An MCS Investments, Inc. Company)
MII	PageWiz Image (Microtek)
MII	MicroStat II Data File
MII	Wii Avatar File (Nintendo)
MIL	Group 4 Fax File
MIL	Micro Illustrator Uncompressed Graphic
MILK	MilkDrop Winamp Visualization Plug-in Preset File (Nullsoft, Inc.)
MIM	Multi-Purpose Internet Mail Extensions (MIME) File
MIME	Multi-Purpose Internet Mail Extensions (MIME) File
MIMG	Multi-Channel Server (MCS) Component Policy Editor Image Component (Volantis Systems Ltd.)
MIN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MINDTEASER1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MINESWEEPERSAVE-MS	Minesweeper Saved Game (Microsoft Corporation)
MINGW	Mingw Make File
MINGW32	Mingw Compiler File
MINI	miniControl Data File (LucaNet)
MINIGSF	Winamp Gameboy Advance Portable Sound File (Nullsoft)
MINIPSF	Playstation Sound Format (Miniature Playstation Sound Format) (Sony Corporation of America)
MINIPSF2	Playstation 2 Sound Format (Miniature Playstation Sound Format) (Sony)
MINIUSF	Nintendo Ultra 64 Sound Format (Nintendo)
MINT	Linux Mint mintInstall Software Installation File
MIO	MyInfo Topic File (Milenix Software)
MIO	mexReader Multimedia File
MIO	MIO Compressed Audio
MIO	Iphoto4 Programs Fio File
MIO	Mio Technology Generic Communications Format (Mioplanet Technologies, Inc.)
MIP	Paint Shop Pro Multiple Image Print File (Corel Corporation)
MIP	MODDE Project (Umetrics AB)
MIPSEL	Mips File
MIR	Mirage Project File (TVPaint Developpement)
MIS	3WayPack Missing Data Pointers (The Three-Mode Company)
MIS	Tom Clancey's Ghost Recon Mission File (Red Storm Entertainment)
MIS	MagicInstall Installation Script
MIS	Delta Force Land Warrior Mission (NovaLogic, Inc.)
MIS	Tribes 2 Game File (Sierra)
MIS	Game Mission File
MISC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MISCTOOL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MISS	Homeworld Missle Data (Sierra Entertainment, Inc.)
MISTRALLOGO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MISTY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MITSU	Mitsubishi S340-10 Color Sublimation Printer Bitmap (Mitsubishi Companies)
MIX	PhotoDraw 2000 Multilayer Picture File (Microsoft Corporation)
MIX	Power C Object File
MIX	Don Knuth's MIX Emulator
MIX	Windows Sound MIX (Microsoft Corporation)
MIX	Techno eJay Music Mix File
MIX	OzWin CompuServe E-mail/Forum Access Index File
MIX	Picture It! Multilayer Picture File (Microsoft Corporation)
MIX	Project Dogwaffle Type 2 Mixing Palette (TheBest3D.com)
MIX	Command & Conquer Picture/Sound File (Westwood Studios)
MIZ	Winamp Compressed MIDI File
MJ	MovieJack DVD Ripper File
MJB	PDA Mystery Juke Box Generation Profile (Paul Duggan - PDAWare)
MJF	Mjuice Secure Music Files
MJP	VTech MJP Video
MJP	Media Center Plug-in (J. River, Inc.)
MJP	Media Jukebox
MJPG	SMJPEG Video
MJR	Media Jukebox Registration File (J. River)
MJS	7400 Costing Database File (Mijas Software)
MK	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MK	Make File
MKA	Matroska Audio Stream (Matroska Association)
MKD	Malz++Kassner CAD5 Drawing
MKE	Make File
MKEXT	OS X Mach Kernel Extension File (Apple Inc.)
MKF	Karabox Music File (NesyLine)
MKG	Make File
MKH	WinMark Pro Mark File (Synrad, Inc.)
MKI	Picture File
MKI	MediaKnife Animated Internet Picture
MKI	MagView Japanese Makichan Format Graphic
MKJ	MKJamz
MKL	Malz++Kassner CAD5 Drawing Library
MKL	Créatoria
MKM	Matroska Media File (Matroska Association)
MKR	Train Simulator Marker File (Microsoft Corporation)
MKR	McCullough Knowledge Explorer Knowledge Representation (Richard H. McCullough, Knowledge Engineer)
MKR	Tonline Bsw4 Internet File
MKS	Matroska Subtitles Stream (Matroska Association)
MKS	Sierra Mastercook Cookbook File
MKS	Tact Data
MKTS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MKV	Matroska Video Stream (Matroska Association)
MKW	Compressed Audio File (Michael K. Weise)
MKZ	PokerOffice Backed Up Database (PokerOffice.com)
ML	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ML	F# Source Code (Microsoft Corporation)
ML	ML language Source Code File
ML	Camomile Configuration/Module File
ML0	MultiLedger Company Information (CheckMark Software, Inc.)
ML1	MultiLedger Balance (CheckMark Software, Inc.)
ML2	Mein Leben II Personal Profile (Appadaumen Productions)
ML2	Tripos MOL2 Molecule File
ML2	MultiLedger Budget (CheckMark Software, Inc.)
ML20	MSN Webcam Recorder Video File
ML256	MessageLock Encrypted Message (Encryptomatic LLC)
ML3	Milestones 3.x Schedule (KIDASA Software, Inc.)
ML3	MultiLedger Chart of Accounts (CheckMark Software, Inc.)
ML4	Milestones ver 4.0 and 4.5 Schedule (KIDASA Software, Inc.)
ML4	MultiLedger Customers (CheckMark Software, Inc.)
ML5	Milestones ver 5.0 and 5.01 Schedule (KIDASA Software, Inc.)
ML5	MultiLedger Vendors (CheckMark Software, Inc.)
ML6	Milestones Professional 2000 Schedule (KIDASA Software, Inc.)
ML6	PowerPoint Milestone File (Microsoft Corporation)
ML6	MultiLedger Items (CheckMark Software, Inc.)
ML7	Milestones Professional 2002 Schedule (KIDASA Software, Inc.)
ML7	MultiLedger Salesperson (CheckMark Software, Inc.)
ML8	Milestones Professional 2004 Schedule (KIDASA Software, Inc.)
ML8	MultiLedger Job (CheckMark Software, Inc.)
ML9	MultiLedger Transactions (CheckMark Software, Inc.)
ML9	Milestones Professional 2004U Schedule (KIDASA Software, Inc.)
MLA	Milestones Professional 2006 Schedule (KIDASA Software, Inc.)
MLB	OpenVAX Macro Library
MLB	Peachtext List Manager (Peachtree Software (Sage Software SB, Inc.))
MLB	MultiLedger Ship Via (CheckMark Software, Inc.)
MLB	FoxPro for Macintosh Library
MLB	Symphony Macro Library File
MLB	MyLittleBase Database
MLC	Windows Vista Language Interface Pack (Microsoft Corporation)
MLC	mAirList Cart Set (Torben Weibert)
MLC	MultiLedger Ship To (CheckMark Software, Inc.)
MLD	mAirList Desktop (Torben Weibert)
MLD	MultiLedger Index (CheckMark Software, Inc.)
MLD	Van Dorn Plastic Injection Molding Machine Saved Process
MLD	Multilizer Dictionary
MLD	Polyphonic Ringtone File for Phones
MLD	MyLabel Designer Deluxe Label File (Avanquest Publishing USA, Inc.)
MLE	mAirList Event List (Torben Weibert)
MLF	UpdateEXPERT Machine List File (St. Bernard Software)
MLI	3D Studio Material-Library File (Autodesk, Inc.)
MLI	F# Source Code (Microsoft Corporation)
MLI	Encyclopedia Media List
MLI	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MLI	AutoCAD Material-Library File (Autodesk, Inc.)
MLI	Camomile Individual Module File
MLINEFONT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MLK	Sierra Mastercook Look File
MLM	Novel Groupwise E-mail File
MLN	AutoCAD Multiline Definition (Autodesk, Inc.)
MLNK	Multi-Channel Server (MCS) Component Policy Editor Link Component (Volantis Systems Ltd.)
MLP	mAirList Playlist (Torben Weibert)
MLP	Meridian Lossless Packing Audio File (Meridian Audio)
MLS	Milestones 1.x and 2.x Schedule and Simplicity (all ver) (KIDASA Software, Inc.)
MLS	Skype Localization Data (Skype Technologies S.A.)
MLS	Miles Sound Tools Compressed DLS
MLS	mAirList Script (Torben Weibert)
MLT	mAirList Desktop Template (Torben Weibert)
MLT	Forecast Pro Multivariate Forecast File (Business Forecast Systems, Inc.)
MLTV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MLYT	Multi-Channel Server (MCS) Layout Policy Editor Layout Policy (Volantis Systems Ltd.)
ML_	Mainlog Compressed Mud Log (Mailog)
MM	Lightscape Material Map
MM	Xcode Core C Program (Apple Inc.)
MM	FreeMind Mind Map
MM	Macro Mania Macro
mm	groff Source in mm Format
MM	Metamath ASCII Database (Norman Megill)
MM	Multimate Advantage File
MM	Meme Virtual Reality World (Immersive Systems Inc.)
MM	Rise of Nations Campaign Media File (Microsoft Corporation)
MM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MM3	Mortgage Minder Ver. 3 Saved Mortgage Configuration File (CW Technical Services)
MM4	Mortgage Minder Ver. 4 Saved Mortgage Configuration File (CW Technical Services)
MM5	Makromat Macroeconomic Model Data (University of Muenster, Germany)
MMA	Grlib Cppima Scilimag File
MMA	Master Album Maker Album File (Intrepid Mouse Limited)
MMAP	MindManager Brainstorm and Process Control Map (Mindjet)
MMB	MultiMedia Builder
MMB	Oracle Forms Menu Binary Source Code
MMBK	MannaBook (MannaBook Software, Inc.)
MMBK	My Money Vista Database Backup File (ZPSSoft)
MMBM	MannaBook (MannaBook Software, Inc.)
MMC	Clipart DLLbackup Autoshape File (Microsoft Corporation)
MMC	Office Media Content
MMC	MicroCase Boundary File (Cengage Learning)
MMC	Media Catalog
MMD	Summit Membership Manager Database (MIE Software Pty Ltd)
MMD	MangoData Multi-User Database (MightyMango)
MMD	Nigarva Downloader Download List File (K&A Corporation)
MMD	DocsAlive Multimedia Document (Softedge-Systems Ltd)
MMD	MacroModel Molecular Mechanics File (Columbia University Chemistry)
MMD	Media Processing Server Studio Data (Nortel Networks)
MMD	Cumulate Draw Editable MMD Format (Cumulate Labs)
MMD	mAirList Metadata (Torben Weibert)
MME	Multi-Purpose Internet Mail Extensions (MIME) File
MME	Multimedia Protector project file (Mirage Computer Systems)
MMF	Multimedia Protector Protected Database (Mirage Computer Systems GmbH)
MMF	MathMagic Equation File (InfoLogic, Inc.)
MMF	McAfee VirusScan Configuration (Networks Associates Technology, Inc.)
MMF	Yamaha SMAF Synthetic Music Mobile Application Format (Yamaha Corporation of America)
MMF	Mail File (Microsoft Corporation)
MMF	Media Processing Server Studio Reference Name (Nortel Networks)
MMF	AppMind Message Management File (Appmind Software AB)
MMF	Meal Master Format
MMG	mkvmerge GUI Saved Muxing Settings (Moritz Bunkus)
MMH	MS Media Manager Helper DLL
MMI	Media Processing Server Studio Index (Nortel Networks)
MMI	Memo Open Client
MMJB_MIME	MusicMatch Jukebox MIME ID File (MUSICMATCH, Inc.)
MML	MolMol Molecule Description File
MML	Aleph One Marathon Markup Language (Marathon Open Source)
MML	FrameMaker (Adobe Systems Incorporated)
MML	MathML Math Embedded HTML File
MML	Mail Meta Language
MML	MySoftware or ProVenture MailList Program Mail List (Elibrium, LLC)
MMLD	EdGCM Data File (The EdGCM Cooperative Project of Columbia University)
MMM	Multiple Master Font File (Adobe Systems Incorporated)
MMM	Multimedia Movie (Microsoft Corporation)
MMM	MacroMind Directory RIFF/RMMP Format Movie
MMO	RapidFile Memo Writer
MMO	Hyper File Memo (PC SOFT)
MMO	Musicmatch On Demand Playlist (Musicmatch, Inc.)
MMO	Memory-Map Navigator Overlay (Memory-Map, Inc.)
MMOD	MacroModel Molecular Mechanics File (Columbia University Chemistry)
MMP	Bravado Board Video Output Format
MMP	Grand Theft Auto Multiplayer Map File (Rockstar Games)
MMP	MixMeister Playlist (MixMeister Technology)
MMP	MicroMedia Playlist (Demonic Software)
MMP	MindManager Map File (Mindjet)
MMP	Master Album Maker Album Project File (Intrepid Mouse Limited)
MMP	CoCo Systems VisiMap
MMP	Bravado Board Output Video Format
MMP	MS Music Producer
MMP	Multimedia Player Movie Clip
MMP	Gammadyne Mailer Project File
MMP	EPOC Makmake Makefile Project
MMPBT	MindManager Branch Template File
MMPT	MindManager Template
MMR	LOKI Character Template (Synthetic Realms)
MMS	JPEG-6b File
MMS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MMS	NT MidiMagic Song Information (NovaTech Design)
MMS	Miles Sound Tools
MMSCRIPT	MindManager Script File
MMT	Nimbus 7 SAMS Data File
MMT	CoCo Systems VisiMap
MMT	egseing Memory Dump Data
MMV	Dega Movie Capture Format
MMV	Sony MovieShaker File
MMW	Multimedia World Magazine
MMW	Media Content
MMW	AceMoney Financial Data (MechCAD Software LLC)
MMX	Command & Conquer Red Alert 2 Map File (Westwood Studios)
MMX	Oracle Forms Compiled Menu
MMX	MarkMagic Import/Export
MMZ	MusicMatch Theme File (MUSICMATCH, Inc.)
MN1	Money Ver 1 Data File (Microsoft Corporation)
MN2	Descent2 Mission File
MN2	Money Ver 2 Data File (Microsoft Corporation)
MN3	Descent 3
MN3	Descent3 Mission File
MN3	Money Ver 3 Data File (Microsoft Corporation)
MN4	Money Database (Microsoft Corporation)
MN4	Money Ver 4 Data File (Microsoft Corporation)
MN5	Money Ver 5 Data File (Microsoft Corporation)
MN6	Money Ver 6 Data File (Microsoft Corporation)
MN7	Money Ver 7 Data File (Microsoft Corporation)
MN8	Money Ver 8 Data File (Microsoft Corporation)
MN9	Money Ver 9 Data File (Microsoft Corporation)
MNB	MuPAD File
MNC	My Notes Center File
MNC	AutoCAD Compiled Menu (Autodesk, Inc.)
MND	AutoCAD Menu Program (Autodesk, Inc.)
MND	MusicNet Music Download (MusicNet)
MND	Cerious Mandelbrot Image
MND	MNI Mandelbrot for Windows
MND	Fractal Forge Ver. 2.x Fractal Parameters
MNF	Saved MSN Search
MNG	DeLorme Map'n'Go Map
MNG	Animation Shop Animation (Corel Corporation)
MNG	Keyboard File Manager MIDI/MID Files Floppy Database (Yahama)
MNG	Multi-image Network Graphic Animation
MNI	Cerious Mandelbrot Image
MNL	Zortech 3 Binary File
MNL	AutoCAD AutoLISP Functions Related to Menu (Autodesk, Inc.)
MNL	OrCAD Netlist File (Cadence Design Systems, Inc.)
MNO	Monopoly Saved Game
MNO	Macromedia Design Notes
MNPF	NoteStar v1.2a + Graphic (Jayden Carr)
MNR	AutoCAD Compiled Menu (Autodesk, Inc.)
MNR	IBM Voice Type Language Newuser File
MNS	AutoCAD ASCII Menu (Autodesk, Inc.)
MNT	Foxpro Menu Memo (Microsoft Corporation)
MNU	AutoCAD Menu Template (Autodesk, Inc.)
MNU	RadASM Menu File (KetilO)
MNU	FoxPro Menu
MNU	HP NewWave Advanced Macro
MNU	Menu File
MNU	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MNW	Menu File
MNX	Foxpro Menu (Microsoft Corporation)
MNX	AutoCAD Compiled Menu (Autodesk, Inc.)
MNY	Money Data File (Microsoft Corporation)
MO	Modula-3 Object File
MO	Dymola Simulation
MO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
mo	Message Catalog Binary File
MO	GNU Gettext Machine Object File (Free Software Foundation)
MO1	Odyssey Disk/ROM Image
MO3	MO3 MOD Audio Format (un4seen developments)
MOB	Master of Orion 3
MOB	Device Definitions
MOBAPP	MOBILedit! Application (COMPELSON Laboratories)
MOBDRV	MOBILedit! Driver (COMPELSON Laboratories)
MOBI	Mobipocket eBook Format (Amazon.com, Inc.)
MOBSKIN	MOBILedit! Skin (COMPELSON Laboratories)
MOC	MOCHA Javascript
MOC	QT Meta-Object Compiler Header Files (Trolltech)
MOCHA	MOCHA Javascript
MOD	Amiga and PC Tracker Module
MOD	WinBoard Import Module (Ivex Design International)
MOD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOD	Peachtext Database (Peachtree Software (Sage Software SB, Inc.))
MOD	Femap (UGS Corp.)
MOD	CADdy++ Mechanical 2D/3D Model Data (DataSolid GmbH)
MOD	JVC Everio Digital Video File (JVC Americas Corp)
MOD	PHP Source Code
MOD	PDP-10 MODULA-II Compiler Source
MOD	CATIA Model File (Dassault Systèmes)
MOD	File Implementing DOS Support for Windows DLL's
MOD	Multiplan Spreadsheet (Microsoft Corporation)
MOD	Music File
MOD	Monarch Model (Datawatch Corporation)
MOD	Module
MOD	Modula-2 Program File
MOD	Music Module
MOD	Model File
MOD	ProModel Optimization Software Suite Model
MOD	Clarion for Modula-2 Source Code File (SoftVelocity)
MOD	Connectivity Memory Model Cell Specific Plasticity Functions on Incoming Synapses Input File
MOD	Digital Music Sound Clip
MOD	EPOC Model Definition
MOD	Windows Kernel Module
MOD	Multiplan Spreadsheet
MODD	Picture Motion Browser Data (Sony Corporation of America)
MODEL	LEGO CAD Model File (The LEGO Group)
MODEL	PlantWALK Model
MODEL	CATIA Model (Dassault Systèmes)
MODEL	Ribbons Molecular Model
MODEL	ActiveModeler Avantage Process Model (KAISHA-Tec Co. Ltd.)
MODEM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM4	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM5	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM6	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM7	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM8	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODEM9	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODERNTALKING	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODULAE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODULE	Gambas Gambas Module Source File
module	Drupal Module (Dries Buytaert)
MODULE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MODULES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOF	MSinfo (Microsoft Corporation)
MOF	Systems Management Server (SMS) Managed Object Format (Microsoft Corporation)
MOGG	Ogg Vorbis File Variation
MOHO	Anime Studio Project File (Lost Marble)
MOI	French Text File
MOI	JVC Everio Digital Audio File (JVC Americas Corp)
MOI	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOL	MOdule (play)List
MOL	MDL Molfile Molecule File (MDL Information Systems, Inc.)
MOL	Easy Palette Object Library
MOL2	WebLab Molecular Viewer File
MOL2	Portable Representation of a SYBYL Molecule
MOM	SPEFO Stellar Spectra Analysis File
MOM	CDrom Runtime Database File
MOM	Xcode Compiled Core Data-based Data Model (Apple Inc.)
MON	Firefox Bookmark Backup File
MON	Virgin Games Monopoly Deluxe
MON	ReadMail Monitor
MONDAY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MONEY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MONICA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MONO	Monolith Munged Encoded File
MONO	Bi-level Bitmap in Least-Significant-Byte First Order
MONS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MONSTER2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MONTE	CRiSP Harvest File
MOO	QuickTime Movie Clip (Apple Inc.)
MOO	MoonRock Language Source Code File
MOOD	Amarok Data File
MOOD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOON	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOOV	QuickTime Movie (Apple Inc.)
MOP	NS/Elite Display 3.12 Macro Object Path File
MOP	M.Fujimiya's Morpher for Windows 1.4 Work File
MOP	Mopac Input File
MOP	MDL Molfile MOPAC Input Format (MDL Information Systems, Inc.)
MOR	Corel Shared Writing Tools 9.0 File
MOR	Poser 3D Morph Target File
MORE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MORTBATS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOS	Infinity Game Engine Compressed Background and GUI Tile Info (BioWare Corp.)
MOS	MACAOS Compressed Tranismission File (Elprint AS)
MOS	Leaf Camera RAW File
MOS	Infinity Game Engine Background and GUI Tile Info (BioWare Corp.)
MOS	Dymola Simulation
MOS	System DOS 6.2 File
MOT	Sharp cellphone GX Flash File (Sharp)
MOT	Linux Load Instructions
MOT	Phoneme Translation File
MOT	Motorola JADE Ringtone
MOTBIN	Motorola JADE Ringtone
MOTIF	Microangelo Motif
MOTIF	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOUNT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOUSE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOUSETEXT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOV	QuickTime Video Clip (Apple Inc.)
MOV	AutoCAD AutoFlix Movie (Autodesk, Inc.)
MOV	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOVE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOVEMON	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOVERADDIN	Mover Add-in (Nicodemous Bytes)
MOVERBACKUP	Mover Backup Set (Nicodemous Bytes)
MOVERCONFIG	Mover Configuration (Nicodemous Bytes)
MOVERDB	Mover Database (Nicodemous Bytes)
MOVERREG	Mover Registration Info (Nicodemous Bytes)
MOVERTEMPLATE	Mover Template (Nicodemous Bytes)
MOVES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOVIE	QuickTime Movie (Apple Inc.)
MOVIE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOX	ExtendSim Model File (Imagine That Inc.)
MOZ	Netscape Temp File
MOZART	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MOZEML	Thunderbird Mail Message File (Mozilla Corporation)
MP	cGPSmapper Polski Format Mapy -- Polish Map Format (Stanislaw Kozicki)
MP	Maya Personal Learning Edition (Alias Systems, a division of Silicon Graphics Limited)
MP	Multiplan File
MP	MetaPost Macro
MP	Monochrome Picture TIFF Bitmap
MP	EARS Component File
MP+	MPEG Plus Audio File
MP1	MPEG Audio Stream, Layer I
MP2	Masterpoint Red Points File (ABF Masterpoint Centre)
MP2	MPEG Audio Stream, Layer II
MP21	AXMEDIS MPEG-21 File (AxMediaTech S.R.L.)
MP2M	Max Payne 2 Mod File (Rockstar Games)
MP2S	MPEG-2 Video
MP2S	Max Payne 2 Saved Game (Rockstar Games)
MP2V	MPEG Audio Stream, Layer II
MP3	Wrapster Wrapped File
MP3	MPEG Audio Stream, Layer III
MP3	mp3PRO Audio File
MP3	Masterpoint Green Points File (ABF Masterpoint Centre)
MP3	SHARP MZ-series Emulator File
MP3	AlbumWrap Wrapped Music File Archive (Infamus Software LLC)
MP3MAN	MP3Man Playlist (You 2 Software)
MP3PRO	mp3PRO Enhanced MP3 File
MP4	MPEG-4 Video File
MP4V	MPEG-4 Video File
MP5	Maple V Release 3 Windows/DOS File (Maplesoft, a Division of Waterloo Maple Inc.)
MP5	Masterpoint Red and Green Points File (ABF Masterpoint Centre)
MP?	LoseThos Compiler Map File (Terry A. Davis)
MPA	MPEG Audio Stream, Layer I, II or III
MPA	E-Designer (Beijer Electronics)
MPA	BusinessMAP Map Layer File (ESRI)
MPA	Palm Memo File
MPB	TruVideo Video-only MPB Stream
MPB	MyPhoneExplorer Backup File (Franz Josef Wechselberger)
MPB	Maintenance Parts Bin Database (Nhuntsoftware)
MPC	Project Calender (Microsoft Corporation)
MPC	Musepack Audio File
MPC	Collectorz.com MP3 Collector MP3 Collection Data (Collectorz.com)
MPC	VersaPro Compiled Motion Block
MPCB	ReliaSoft MPC 3
MPCF	MarketPlace Pro Configuration Settings (Claritas)
MPCPL	Media Player Classic Playlist
MPD	SCSI MiniPort Driver (Microsoft Corporation)
MPD	Windows Mini-port Driver
MPD	MLCad LDraw Multipart Model File (LM-Software)
MPD	ABC Programming Language Monadic Predicate
MPD	Project Database File (Microsoft Corporation)
MPD	My Digital Photos Filmstrip (Super Win Software)
MPD	File List Creator MP3 Playlist (WenSoftware)
MPD	MapDraw Chemical Sequence Map (Biomolecular Computing Resource (BimCore) at Emory University School of Medicine)
MPDEX	MPdex MP3 Database Utility
MPE	MPEG Movie Clip
MPE.EXE	MP3 Digital Player Wrapper
MPEG	MPEG 1 System Stream
MPF	MainActor Project (MainConcept AG)
MPF	MosASCII Discontinued Project Workspace File (Robert DeFusco)
MPF	Design Gallery (Microsoft Corporation)
MPF	MPF Audio File (Mobijet Science & Technology Co., Ltd.)
MPFA	FASTA Format DNA and Protein Sequence Alignment
MPG	MPEG Animation
MPG	MPEG 1 System Stream
MPG	ProgDVBR MPEG2 Video File
MPG	Salt Lake City Game Movies File
MPG4	MPEG-4 Media File
MPGA	Mpeg-1 Layer3 Audio Stream
MPH	Publisher (Microsoft Corporation)
MPH	COMSOL Multiphysics Model File (COMSOL, Inc.)
MPH	Photoline4 Morphing File
MPI	MPlayer Control File
MPI	Links98 Golf Game File
MPJ	STOIK Morph Man Project Information File
MPJ	MINITAB Project File (Minitab Inc.)
MPJ	Sometimes .MP3 File
MPJ	Mountain Video Editing File
MPJ	RoboHTML Project
MPK	Augmented Microsoft-Project (Microsoft Corporation)
MPKG	Meta Package File
MPL	AVCHD Playlist
MPLS	Blu-ray Movie Playlist Information (Blu-ray Disc Association)
MPM	MPMOffice Data File (MPMsoft Medical Billing Software)
MPM	Max Payne MOD Archive (Rockstar Games)
MPM	MPEG Movie
MPM	WordPerfect MathPlan Macro (Corel Corporation)
MPN	mophun Game File (morphun)
MPNT	MacPaint Bitmap File
MPO	Augmented Microsoft-Project (Microsoft Corporation)
MPO	Sheffield Dictionary File
MPP	Microsoft Project Project File (Microsoft Corporation)
MPP	CAD Drawing File
MPP	Musepack Audio File
MPP	Zortech 3 README File
MPP	BX-24 Basic Express Compiler Map
MPQ	Blizzard Game Data File (Blizzard Entertainment)
MPR	MPEG Audio Stream, Layer I, II or III
MPR	Westwood Studios Game File
MPR	Visual Foxpro Solution Menus File (Microsoft Corporation)
MPR	FileMaker Spelling Dictionary
MPR	Live for Speed Multiple Player Replay
MPR	Multilizer Project File (Multilizer, Inc.)
MPR	Music Publisher Backup Data File (Braeburn Software)
MPR	AutoCAD Mass Properties Report (Autodesk, Inc.)
MPS	Multimedia File
MPS	MPEG-1 Audio and Video File
MPS	Max Payne Saved Game (Rockstar Games)
MPS	Casio PDL Pocket Streets Map (Casio Computer Co., Ltd.)
MPS	MapSource GPS Mapping Interface Waypoints (Garmin Ltd.)
MPS	MySweetNix!
MPS	Pocket Streets Map File (Microsoft Corporation)
MPT	Multipage TIFF Bitmap
MPT	Project Template File (Microsoft Corporation)
MPV	MyPhotoZip File
MPV	Project View (Microsoft Corporation)
MPV	MPEG-1 Video File
MPV2	MPEG Audio Stream, Layer II
MPW	Oc2.316s Cakit File
MPW	mosascii m2 and MosASCII Project Workspace File (Robert DeFusco)
MPX	Project Export File (Microsoft Corporation)
MPX	RCA/Lyra Handheld MP3 Player File (RCA)
MPX	Alpha Five Temporary Index Information (Alpha Software, Inc.)
MPX	BX-24 Basic Express Compiler Map
MPX	Foxpro Compiler Menu (Microsoft Corporation)
MPY	RCA/Lyra Handheld MP3 Player File (RCA)
MPZ	SoundSlimmer Compressed MP3 Audio (Sound Genetics Inc.)
MPZ	MyPhotoZip File
MPZ	Moove Resource Description File (moove Corporation)
MPZ	SignIQ Project (ImpulseLogic)
MQ4	MetaTrader Indicator (MetaQuotes Software Corp.)
MQC	CP/M Disk Drive Information File
MQD	Malete Query Data (OpenIsis)
MQL	MetaTrader Indicator File (MetaQuotes Software Corp.)
MQP	Multiquence Project
MQV	Sony Movie Player Format (Sony Corporation of America)
MQX	Malete Query Access File (OpenIsis)
MRA	VilagRadio Recorded Radio Program (MAVIP Ltd)
MRB	C++ Multiple Resolution Bitmap Graphic
MRC	Bibliographic Data Format
MRC	MIRC Script File
MRD	Infinity Document (MathRevolt)
MRD	Malete Record Data File (OpenIsis)
MRD	SILVERRUN RDM Database Schema File (Grandite)
MRD	Instron Series 9 Test Data File (Illinois Tool Works Inc.)
MRES	Homeworld (Sierra Entertainment, Inc.)
MRF	WinMorph Project Information File
MRF	GPS Pathfinder Office Geoid Grid File (Trinble Navigation Limited)
MRF	MeterReading Data (Dataconomy)
MRF	Marks Russel File
MRF	Macintosh Font
MRF	Grade Busters Teacher Tools File
MRF	Morpheus Saved Game
MRF	MultiEx Commander Resource File (XeNTaX)
MRG	Merge File
MRG	DESQview (Symantec Corporation)
MRI	MRI Scan
MRIMG	Macrium Reflect Disk Image Backup (Paramount Software UK Ltd)
MRK	Windows 95 User Benchmark
MRK	Informative Graphics Markup File
MRK	SleepScan and Ceegraph Stores Technician (User) Comments (Bio-logic Systems Corp.)
MRK	MissionRisk
MRK	CSI Markup File
MRK	TAPCIS Marked Messsage Commands
MRLV	Multi-Channel Server (MCS) Component Policy Editor Rollover Image Component (Volantis Systems Ltd.)
MRO	SharpEye Music Reader File
MRP	Infinity Solution Plot (MathRevolt)
MRS	Gunz Game Data (MAIET entertainment, Inc.)
MRS	Clone Remover Saved Duplicates List (Moleskinsoft)
MRS	WordPerfect Macro Resource File (Corel Corporation)
MRW	Sony (Minolta) Raw Image File (Sony)
MRX	Malete Record Access File (OpenIsis)
MS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MS	3ds Max Script Source Code (Autodesk, Inc.)
MS	Checksum File for Anti-Virus
MS	Formatted Manual Page with MS Macros
MS	Maple Worksheet (Maplesoft, a Division of Waterloo Maple Inc.)
MS	Modula-3 Intermediate Assembly File
MS	Chemstation GC/MS or LC/MS Data (Agilent)
MS1	OzWin CompuServe E-mail/Forum Access Message File
MS3D	MilkShape 3D Model
MS8	Multisim Design (National Instruments Corporation)
MS9	Multisim Design (National Instruments Corporation)
MSA	Memory Stick Audio Format (Sony Corporation)
MSA	Atari MSA Disk Image (Atari)
MSA	Magic Shadow Archive
MSBCM	Business Contact Manager Backup Database (Microsoft Corporation)
MSC	CRiSP Harvest File
MSC	C Makefile
MSC	Microsoft Management Console Snap-in Control File (Microsoft Corporation)
MSC	eYaMosaic Graphic Mosaic (ESRI China (Beijing))
MSC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MSCPC	MaintScape Collection (GrandRavine Software Limited)
MSCR	Multi-Channel Server (MCS) Component Policy Editor Script Component (Volantis Systems Ltd.)
MSD	Diagnostic Utility Report (Microsoft Corporation)
MSD	Maxsurf Design File (Formation Design Systems Pty Ltd.)
MSD	[Unknown]
MSD	Macro eXpert Macro (GrassSoftware)
MSD	Advanced Key and Mouse Recorder Macro (GrassSoftware)
MSD	Multimedia Studio Document (Burton Software)
MSDEV	Msvc Make File
MSDL	Manchester Scene Description Language
MSDVD	Windows DVD Maker Project (Microsoft Corporation)
MSE	Bwsb120a Demo File
MSF	EarthLink E-mail Message File (EarthLink, Inc.)
MSF	Thunderbird Mail Summary File (Mozilla Corporation)
MSF	Netscape Mail Mail Summary File (Netscape)
MSF	Multiple Sequence File
MSG	Program Message
MSG	PMMail 2000 E-mail Message File (Blueprint Software Works)
MSG	PMMail/2 E-mail Message File (V.O.I.C.E. (Virtual OS/2 International Consumer Education))
MSG	TAPCIS Captured Messages
MSG	OS/2 Help Message File (IBM)
MSG	FoxPro FoxDoc Message
MSG	Exchange Mail Message (Microsoft Corporation)
MSG	OzWin CompuServe E-mail/Forum Access Message File
MSG	Abaqus/CAE Status Message File (Dassault Systèmes)
MSG	Pegasus Mail Stored Messages To Be Sent (David Harris)
MSG1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MSG2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MSG3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MSH	Orbiter Mesh File (Martin Schweiger)
MSH	MASH
MSH	FLUENT Mesh (Fluent Incorporated)
MSHR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MSI	Windows Installer File (Microsoft Corporation)
MSI	Cerius2 (Accelrys Software Inc.)
MSI	TruNEST Nesting Data (Magestic Systems, Inc.)
MSIF	MyLabel Designer Deluxe Label File (Avanquest Publishing USA, Inc.)
MSK	BMC Software Patrol Icon File
MSK	CARA-Script-Interpreter-Engine Mask
MSK	Animator Mask Format (Autodesk, Inc.)
MSK	Paint Shop Pro Mask File (Corel Corporation)
MSL	ImageMagick Scripting Language File (ImageMagick Studio LLC)
MSL	ProWORX Nxt MSL Loadables (Schneider Electric)
MSL	MAINSAIL Source Code (XIDAK, Inc.)
MSM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MSM	Windows Installer Merge Module (Microsoft Corporation)
MSM	Multisim Circuit Diagram (National Instruments Corporation)
MSN	Microsoft Network MSN Central (Microsoft Corporation)
MSN	MSN Content Plus Installer File (MSN Content Plus Inc.)
MSN	Microsoft Network Document (Microsoft Corporation)
MSN	Descent Mission File
MSN	Network Document
MSNBAK	MSN Mail Backup File (Microsoft Corporation)
MSO	ActiveMime Object
MSO	MedlySound Sound/Module
MSO	FrontPage File (Microsoft Corporation)
MSO	Math Script Object File
MSO	Orgchart File (Microsoft Corporation)
MSO	Word OLE Web Page Storage Stream (Microsoft Corporation)
MSP	Paint Bitmap (Microsoft Corporation)
MSP	Technics Sx KN 5000 Keyboard Manual Sequence Pads File
MSP	Technics Sx KN 6000 Keyboard Performance Pads File
MSP	Windows Installer Patch (Microsoft Corporation)
MSP	Magix Music Studio File
MSPLG	Modem Spy Plug-in File (SoftCab Inc.)
MSPX	XML-based Web Page (Microsoft Corporation)
MSQ	Multimedia Workshop Sound File
MSR	OzWin CompuServe E-mail/Forum Access SYSOP File
MSRCINCIDENT	Windows Remote Assistance Request (Microsoft Corporation)
MSS	Manuscript Text File
MSS	MediaShout Presentation Script (MediaComplete)
MSS	Game Score
MSS	Miles XMIDI Sequence with DLS Data
MSS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MSSTYLES	Windows XP Visual Style (Microsoft Corporation)
MSSYTLES	Windows Visual Style File
MST	ChemFinder Chemical Structure Index
MST	Presentation Master Presentation Document (Corel)
MST	Pension System Master File (DATAIR Employee Benefit Systems, Inc.)
MST	Minispecification
MST	Visual Test Source File
MST	Room Arranger Design File (Jan Adamec)
MST	Windows SDK Setup Transform Script (Microsoft Corporation)
MSU	Vista Hotfix Installer Package (Microsoft Corporation)
MSU	Blaise File (Statistics Netherlands)
MSV	MyStars! Saved View (Relative Data, Inc.)
MSV	Memory Stick Compressed Voice File (Sony Corporation of America)
MSVC	Msvc Make File
MSW	Word Text File (Microsoft Corporation)
MSWMM	Windows Movie Maker Project (Microsoft Corporation)
MSX	Magic Splitter Split File Rebuild Information (Kynosoft, Brescia)
MSX	Compressed CP/M File Archive
MSX	Age of Empires II: The Conquerors Expansion Multi-player Saved Game (Microsoft Corporation)
MSX	Blaise File (Statistics Netherlands)
MSX	Image Format
MSX	SuperGraphic Studio Message File (Time-O-Matic, Inc.)
MSZ	MiSZle Data/Parameter File (Mystic Fractal)
MS_	Winhelp Compressed File
MT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MT2	MadTracker Ver. 2.0 Module/Song (Yannick Delwiche)
MT2S	AVCHD Video File
MT9	Music 2.0 Song or Album
MTA	Flight Simulator Maintenance File (Microsoft Corporation)
MTB	MINITAB Exec File
MTD	Digital Sheet Music (Big Endian) (Musicnotes, Inc.)
MTD	gMote Gesture Set File (Handform)
MTE	MadTracker Envelope File
MTE	TargetExpress Target (MCW Technologies Inc.)
MTF	Mediatek Font
MTF	MicroSurfer File
MTF	Mathe Vektor MTF File
MTF	Darkstone Archive
MTG?	Jay Klein Making the Grade Teacher Gradebook Program
MTGA	Homeworld (Sierra Entertainment, Inc.)
MTH	Derive Math File
MTHM	Multi-Channel Server (MCS) Theme Policy Editor Theme Policy (Volantis Systems Ltd.)
MTI	MadTracker Instrument File
MTI	Musitron MUSILI.ZIT Compressed File
MTK	Matrikon Software License File
MTK	MPU-401 Trakker
MTL	Mastercam Mill Tool Library (CNC Software, Inc.)
MTL	MathLook File
MTL	Alias Material (Autodesk, Inc.)
MTM	MultiTracker Music Module
MTOOL	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MTP	Minitab Portable Worksheet (Minitab Inc.)
MTP	MadTracker Pattern File
MTP	L&H Power Translator Pro
MTP	Power Translator Document (Language Engineering Company)
MTR	RealFlight Radio Control Airplane Description (Knife Edge Software)
MTR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MTS	Viewpoint iPix File
MTS	AVCHD Video Clip - MPEG Transport Stream
MTS	MadTracker Sample File
MTS	Encore Samples File
MTT	Messenger Saved Contact File (Microsoft Corporation)
MTV	MTV Music Generator
MTV	MTV Ray-tracer
MTV	MTV Video
MTW	Minitab Data File
MTW	TRADOS MultiTerm Termbase
MTX	Adobe Atmosphere File (Adobe Systems Incorporated)
MTX	Matrix Spreadsheet (Grove Business Software)
MTX	Anjal2000 Tamil Text File Format Description
MTX	Viewpoint Media Player iPix File (Viewpoint Corporation)
MTX	Max Magic Microtuner Tuning Interchange Document (Victor Cerullo)
MTX	Temporary File often used by a Browser or TWAIN Device
MTX	M-Tx Music-From-Text Translator Source File
MTX	Marked Text Source File
MTX	MadTracker Extension File
MTX	GROMACS: Molecular Dynamics Hessian Matrix Format
MTX	File WSOCK32.MTX Associated with MTX Worm
MTXDEF	Gestionnaire d'extensions Multiple Extension Definition (Définition d'extension multiple) (Francis Gagné)
MTXT	Multi-Channel Server (MCS) Component Policy Editor Text Component (Volantis Systems Ltd.)
MT_	Encore Compressed Audio File
MU	PHASES MULIST Format File
MU	Quattro Menu (Corel)
MUC	Collectorz.com Music Collector Collection Data (Collectorz.com)
MUD	ACT! (Best Software CRM Division)
MUD	Yahoo! Mail Saved Attachment
MUD	zMUD Settings File (Zugg Software)
MUF	Alpha Five Temporary Access Control File (Alpha Software, Inc.)
MUF	ProtoMuck Multi User Forth Program
MUI	Opengl Glut-3.6 File
MUI	Configuration Resource File (Microsoft Corporation)
MUI	Amiga MUI Default Class/Library (SASG)
MUL	SeeYou Flight Data (Naviter)
MUL	Ultima Online Game
MULTICALC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MULTICL2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MULTICL3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MULTICLR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MUM	Matlab CAPE-OPEN Unit Operation Model File (AmsterCHEM)
MUP	Music Publisher Data File (Braeburn Software)
MUS	SCORE Music Publishing System Music Notation File (San Andreas Press)
MUS	Infinity Game Engine Music Control File (BioWare Corp.)
MUS	Harmony Assistant, Melody Assistant, Myriad Music plug-in, Melody Player Music File (MYRIAD)
MUS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MUS	MusicTime/Doom Sound
MUS	Finale Music Score (MakeMusic!)
MUSE	Emacs Muse Project (Free Software Foundation, Inc.)
MUSIC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MUTE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MUX	Trackmania Music File (NADEO)
MUZ	Hover Game MIDI File
MV	Miva Script (Prior to Ver. 4.14) (Miva Corp.)
MV	IRIX makemovie Command Compressed Movie (Silicon Graphics, Inc.)
MV3	Oozic 3D MusicVideo
MV3	AUPEC Audio File
MVA	Matrox Video Card Driver (Matrox Electronic Systems Ltd.)
MVB	Multimedia Viewer (Microsoft Corporation)
MVB	Database
MVB	Manual Storage Format
MVC	Miva Compiled Script (Ver. 4.14 and Later) (Miva Corp.)
MVC	Collectorz.com Movie Collector Data File (Collectorz.com)
MVD	MicroDVD DVD Movie
MVD	MicroVision Database
MVD	Movie Edit Pro Video (MAGIX AG)
MVE	muvee autoProducer Project File (muvee Technologies Pte. Ltd.)
MVE	Wing Commander III MVE Movie File Format
MVE	4DVista Geological Model (Midland Valley Exploration)
MVE	Interplay Video File
MVE	Infinity Game Engine (BioWare Corp.)
MVF	Production Studio Video (Babya)
MVF	AutoCAD Stop Frame File (Autodesk, Inc.)
MVG	ImageMagick Vector Graphic (ImageMagick Studio LLC)
MVHLINK	MyVirtualHome Link to Online Features (Creative Designer Software Pty Ltd)
MVI	AutoCAD Movie Command (Autodesk, Inc.)
MVL	WinMaven Saved Log File (David R. Snow)
MVL	Interplay Multimedia File
MVP	MVPstats Data File (MVP Programs)
MVP	MediaView Project
MVR	AutoCut Configuration File (Autometrix)
MVS	MUSICMATCH Jukebox Visualization (MUSICMATCH, Inc.)
MVU	EchoView Adaptive Binary Optimization Format File (MatrixView Pte. Ltd.)
MVW	Saber LAN Log File
MVX	Intentia International Movex
MVX	Mixer File
MW	Mail Wiper Mail Control File (Mail Wiper, Inc.)
MW	MediaWiki Structured Text (MediaWiki.org)
MW	MacWrite II Text Document (Apple Inc.)
MW	Maple Worksheet (Maplesoft, a Division of Waterloo Maple Inc.)
MW0	Super Mario World File (Nintendo)
MW1	Super Mario World File (Nintendo)
MW1	SILK Spreadsheet
MW2	Super Mario World File (Nintendo)
MW2	MicroWorlds LOGO Activity (Logo Computer Systems Inc.)
MW3	Super Mario World File (Nintendo)
MW4	MechWarrior 4 Map (Game Structure Archive) (Microsoft Corporation)
MWAND	GarageBand Lesson File (Apple Inc.)
MWB	MySQL Workbench Database Structure (MySQL AB)
MWD	Photo Soap2 File
MWD	MWD Configuration File
MWD3	MoneyWorks Data File (Cognito Software)
MWD5	MoneyWorks Data File (Cognito Software)
MWF	MapGuide Author Map Window (Autodesk, Inc.)
MWF	ProMotion Animation
MWI	Medlin Accounting Invoice Layout Information (Medlin Accounting)
MWII	MacWrite II Text Document
MWII	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MWL	Super Mario World Level File (Nintendo)
MWL	Mighty Draw Windows Library (theliquidateher Software, An MCS Investments, Inc. Company)
MWM	Mail Warrior File
MWP	STEP7-Micro/WIN Siemens 200-series PLC Program (Siemens AG)
MWP	Word Pro 97 Smartmaster File (IBM)
MWP	MegaWorks Pack File
MWS	Maple Spreadsheet (Maplesoft, a Division of Waterloo Maple Inc.)
MWS	Medlin Accounting Statement Layout Information (Medlin Accounting)
MWSP	Optix Screen Definition (mindwrap, inc.)
MWSP	ScanTango Plug-in (mindwrap, inc.)
MWT	MetaStock Stock Analysis Template (Equis International)
MWV	MovieWorks File
MW_	Audio Utility Midimach Compressed File
MX	MX Designer Remote Control File
MX	Modula-3 Linker Information
MX	MATLAB Common Matrix Routines (The MathWorks, Inc.)
MX3	MP3 Encoded File
MX3	Bitbop Tuner Locked Sound File
MX3	MATLAB Windows Dynamically Linked Subroutines (The MathWorks, Inc.)
MXC	ArcView Geocoding Index For Read-Write Coverages (ESRI)
MXC2	Music Maker 12 Cache (MAGIX AG)
MXD	ArcMap GIS Project File (Map) (ESRI)
MXD	MX Editor Remote Control Device Configuration File
MXE	VCom Error Report (V Communications, Inc.)
MXE	MXEdit File
MXE	Mindex Effect Album
MXE	Macro Express
MXE	Quatro Pro Startup Macro (Corel)
MXF	Material Exchange Format File
MXF	SimCity Maxis Font File (Electronic Arts, Inc.)
MXF	MX Editor Remote Control File
MXI	Mindex Indices File for Indexed Images
MXI	Proteus File
MXI	Macromedia Extension Information
MXL	Moxcel Spreadsheet
MXL	PackRat 5.0 Support File
MXM	Mindex Master Index File for a Category
MXM	Project/Outlook Team Assign Task (Microsoft Corporation)
MXM	MixMeister BPM Calculation File (MixMeister Technology)
MXMF	Mobile XMF File Format
MXML	Flex Interface Component File (Adobe Systems Incorporated)
MXP	Macromedia Extension Manager
MXP	ArcReader Published Map
MXP	3-matic Project File (Materialise NV)
MXS	ArcView Geocoding Index For Read-Write Shapefiles (ESRI)
MXT	ArcMap Map Template (ESRI)
MXT	C Data (Microsoft Corporation)
MXV	Movie Edit Pro Video Format (MAGIX)
MYB	MYOB Data File (MYOB Technology Pty Ltd.)
MYC	Simply Safe Backup Archive (Joshua Cannon Butcher)
MYD	MySQL Database (MySQL AB)
MYDOCS	MyDocs Drop Target (Microsoft Corporation)
MYI	MySQL Database Index (MySQL AB)
MYL	MYLAI Multilingual Transliteration Scheme
MYM	MyMenu Wii custom menu theme file (Icefire)
MYO	MYOB Data File (MYOB Technology Pty Ltd.)
MYP	Make Your Point Presentation
MYR	Harmony Assistant, Melody Assistant, Myriad Music plug-in, Melody Player Music File (MYRIAD)
MYS	Myst Saved Game (Cyan Worlds, Inc.)
MYT	MyTraffic X AI Aircraft Traffic Database File (BK & simMarket.com)
MYTHS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MYV	Vivaldi Studio Score File (goVivaldi Inc.)
MYW	MyWorld Education Drawing
MZ	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
MZ	MOZART Music Document (David Webber)
MZB	MegaZeux Board
MZC	MOZART Chord Dictionary (David Webber)
MZE	MidiMaze File
MZE	Maze Creator File
MZF	MediaZip Compressed File (ACE)
MZF	SHARP MZ-series Emulator File
MZM	MegaZeux Dynamic Board Section
MZP	MOZART Percussion File (David Webber)
MZQ	SHARP MZ-series Emulator QuickDisk File
MZS	SHARP MZ-series Emulator File
MZT	SHARP MZ-series Emulator File
MZT	MOZART Template File (David Webber)
MZV	Viewpoint Media Player ZoomView Titles (Viewpoint Corporation)
MZX	MegaZeux World
M_C	MailCall 2 File
M_P	Pro/ENGINEER Temporary File (PTC)
M_U	MazeGold Critical File Backup