List Of All Extensions And Filetypes - H

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 H

Extension	Information
H	ADS Include File (Autodesk, Inc.)
H	Header
H	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
H!	Flambeaux Tutorial Database
H++	C++ Header File
H--	Sphinx C-- Header File
H0	Magix Musstu File
H1	Bruker Aspect NMR Data File
H1	Magix Musstu File
H16	VC98 Include 16-bit File
H19	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
H2O	Liquid Entertainment H2O Compressed Archive (Liquid Entertainment)
H2O	H2OMAP Water Master Project File (MWH Soft)
H2O	Water Web Program File (Clear Methods, Inc.)
H32	BC45 32-bit Include File
H3M	Game Map File
H3R	H3R Panasonic Video Camera File (Panasonic Corporation of North America)
H4C	Heroes of Might and Magic Map File
H4R	Possible Container for .MP3 Files
H4V	MPEG-4/AVC, H.264 Video File
H5	HDF5 Data File (The National Center for Supercomputing Applications)
H5B	SuperHeat 5 Building File (Survey Design Associates Ltd.)
H5R	WV-AS50A CD-R Video File (Panasonic Corporation of North America)
H6C	SPP File
HA	Compressed Archive
HAB	HelpMaker Backup file (Vizacc)
HAD	MixlleniumEngine (Haydee) Web Server Module Style File
HAF	HEAT Archive File
HAI	NTgraph Nt09b-2b EMX Library File
HAIRY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HAK	Neverwinter Nights File
HAK	BioWare Aurora Engine File (BioWare Corp.)
HAK	GameHack File
HAL	Mortyr Archive
HAL	Hyper Access Lite OS/2 Data File
HALOGEN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HAM	Amiga Hold and Modify Image (Amiga, Inc.)
HAM	Novell NetWare Disk Drivers NPA
HAMMER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HAN	Viewpoint Headline Studio
HAND	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HANOI	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HAP	Hamarsoft HAP 3.x Compressed Archive
HAPTAR	People Putty Haptek Character (Haptek, Inc.)
HAR	e-Sword Harmony Resource (Rick Meyers)
HARP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HARPSAC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HARPSAC2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HARRIER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HASH	EnCase Forensic Drive Image Hash (Guidance Software, Inc.)
HAT	HAT (HOORA Analysis Tool) Model
HAT	Formula 1 Car Race 2001 Log Hat File
HAV	Video Recorder Video File
HAY	MixlleniumEngine (Haydee) Web Server Module Content File
HAZ	Flight Simulator Texture File (Microsoft Corporation)
HAZ	Train Simulator Hazard File (Microsoft Corporation)
HBB	HAHTtalk Object File
HBC	Home Buyers Calculator Suite
HBC	HyperBac Compressed File (HyperBac Technologies, Inc.)
HBC2	HyperBac Compressed File (HyperBac Technologies, Inc.)
HBE	HyperBac Compressed/Encrypted File (HyperBac Technologies, Inc.)
HBI	Handy Backup Backup Index File (Novosoft LLC)
HBK	HandyCafe Database File (Ates Software)
HBK	Auto Backup Backup Archive (Han-soft Software)
HBK	Hex Workshop Hex Editor Bookmark File (BreakPoint Software, Inc.)
HBK	MathCAD Handbook (Mathsoft Engineering & Education Inc.)
HBK	Humanic Software Accounting Data
HBM	Hotline Book Mark (Hotsprings Inc.)
HBX	Starmoney Macro file
HBZ	Starmoney Macro file
HC	Header File
HC	BI/Suite Hypercube
HC	High Resolution Cantone TIFF Bitmap
HCA	Hammer Call Analyzer IP and TDM Network Traffic (Empirix Inc.)
HCC	HydroCAD Stormwater Modeling System Storage Chamber Definition (HydroCAD Software Solutions LLC)
HCD	C Poet Examples Advanced Inc File
HCE	HydroCAD Stormwater Modeling System Hydrograph File (HydroCAD Software Solutions LLC)
HCF	123 Heading Creator Project File (Mark Hendricks and Hunteridge, Inc.)
HCG	HCLab HCSoft Chart (HCSoft Programación, s.l.)
HCI	HydroCAD Stormwater Modeling System IDF File (HydroCAD Software Solutions LLC)
HCL	Handwritten Claims Log
HCM	IBM HCM Configuration
HCOM	Macintosh Sound
HCP	HydroCAD Stormwater Modeling System Project File (HydroCAD Software Solutions LLC)
HCR	IBM HCD/HCM Production Configuration
HCR	HydroCAD Stormwater Modeling System Rainfall Definition (HydroCAD Software Solutions LLC)
HCR	Half-fold Card File
HCSP	Content Server Web Page (Stellent, Inc.)
HCSS	Hyper Color Swatch Set (SodaBush)
HCT	Symantec Anti-Virus Live Update File (Symantec Corporation)
HCU	HydroCAD Stormwater Modeling System Units Definition File (HydroCAD Software Solutions LLC)
HCW	HTML Help Workshop Conversion Wizard Macro (Microsoft Corporation)
HCX	Harvard Graphics Chart XL Chart (Harvard Graphics)
HD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HD2	Curious Labs Poser Hand File
HDA	HotDocs Auto-Assemble File (Matthew Bender & Company, a member of the LexisNexis Group)
HDAT	Objective Analysis Package Data File
HDAT	vStaticIP Data File (Phil Doyle a.k.a. MrJolly)
HDB	ACT! History File (Best Software CRM Division)
HDB	Nero HD-Backup (Nero AG)
HDC	HD Tach Benchmark File (Simpli Software Inc.)
HDC	HelloDOC Medical Software File (IMAGINE Éditions)
HDD	HelloDOC Medical Software File (IMAGINE Éditions)
HDD	Parallels Desktop for Mac Hard Disk Drive Image (Parallels, Inc.)
HDF	Amiga Hardfile Image
HDF	Help Development Kit Help File
HDF	Procomm Plus Alternate Download File Listing
HDF	Hierarchical Data Format File
HDI	HelloDOC Medical Software File (IMAGINE Éditions)
HDI	HotDocs Auto-Install File (Matthew Bender & Company, a member of the LexisNexis Group)
HDI	AutoCAD Heidi Device Interface (Autodesk, Inc.)
HDK	MAXI Disk Disk Image (Herne Data Systems Ltd.)
HDK	OS/2 Saved SKF Format File (IBM)
HDL	HotDocs Library File (Matthew Bender & Company, a member of the LexisNexis Group)
HDL	Giza Specifier Hidden Line Drawings (20-20 Technologies)
HDL	Procomm Plus Alternate Download File Listing
HDM	Handheld Markup Language File
HDML	Handheld Markup Language File
HDMOV	QuickTime HD Movie (Apple Inc.)
HDMP	WinXP Trouble Report
HDO	Helpdesk-One File
HDP	HDL Designer Project File (Mentor Graphics Corp.)
HDP	Magix Music/Video
HDR	Photoshop (Adobe Systems Incorporated)
HDR	InstallShield Setup Header (Acresso Software Inc.)
HDR	ArcView Header File (ESRI)
HDR	Egret Data File
HDR	MicroSim PCBoard Hole-Drill Schedule Report
HDR	PC-File+ Database Header
HDR	Procomm Plus Message Header
HDR	ArcInfo Binary (Environmental Systems Research Institute, Inc. (ESRI))
HDR	Photomatix HDR Image (HDRsoft)
HDR	Apollo HDRU
HDR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HDR	Radiance HDR Graphics Data
HDRU	Apollo HDRU
HDS	XMap Hierarchical Dataset (Delorme)
HDS	Hierarchical Data System
HDV	Formula 1 Car Race 2001 Season01 Vehicles Arrows File
HDW	Harvard Graphics Draw Vector Graphics (Harvard Graphics)
HDX	Help Index
HE5	Hierarchical Data Format Release 5
HEA	Fifa 2001 Data Feart Legal Screeen
HEAD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEADER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEADERS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEARTS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEARTSSAVE-MS	Hearts Saved Game (Microsoft Corporation)
HEAVYSIGH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEB	DEcomp 3D Scene Data (H|H/G Family of Corporations)
HEC	Grafic Pvquan Quant File
HED	ReliaSoft RG
HED	HighEdit Document
HED	Hi-Eddi
HEH	Scarlett Expert System Compiler Facts File
HEIDELB	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEL	Hellbender Saved Game (Microsoft Corporation)
HELI	RealFlight Radio Control Airplane Description (Knife Edge Software)
HELLFONT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HELLO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HELP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
help	UNIX Help File
HELPER	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HELPSCREEN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEP	Novell NetWare Help Librarian Data File
HEP	HostExplorer Telnet Session Profile (Hummingbird Ltd.)
HER	Grafic GIF File
HERALD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HERBS1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HERBS2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HERBS3	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HERBS4	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HERBS5	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HERE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HERMETICA	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HES	Hudson Entertainment Sound
HESSIAN	Insight II Hessian File (Accelrys Software Inc.)
HESSIANX	Insight II Hessian File (Accelrys Software Inc.)
HEU	Adobe FlashPlayer Adobe FlashPlayer Cache MetaData File (Adobe Systems Inc)
HEX	Macintosh BinHex 2.0 File
HEX	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEX	HUGO Game File
HEX	Magellan GPS Receiver Flash Upgrade File (Thales Navigation, Inc.)
HEX	SPLITGRADE Upgrade File (Heiland electronic GmbH)
HEX	Hex Dump
HEX	Smart Touch Analyze and Retrieve Tool (START) Classic Operator Software Update (HySecurity)
HEY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEY2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HEYCOOLMAN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
hf	UNIX Help File
HFA	ERDAS IMAGINE Hierarchical File Architecture (Leica Geosystems , LLC)
HFB	Ralcgm File
HFB	Hell Fighter Battle File (David Peterson)
HFD	HotDocs Form Document (Matthew Bender & Company, a member of the LexisNexis Group)
HFI	HP Font Info
HFO	Hollywood FX Object File (Pinnacle Systems, Inc.)
HFP	Harry's Filters Filter Preset (Harald Heim (The Plugin Site))
HFS	Macintosh Disk Image on CD
HFT	HaftiX Cross-Stitch Pattern (GRZELA Grzegorz Zochowski)
HFT	HotDocs Form Template (Matthew Bender & Company, a member of the LexisNexis Group)
HFV	Simulated Macintosh Volumes on PC Hard Drive
HFX	Harvard Graphics F/X File (Harvard Graphics)
HFX	US Robotics Rapid Comm Voice Data File
HFX	Hollywood FX Special Effects File (Pinnacle Systems, Inc.)
HFX	HotFax Fax (Smith Micro Software)
HFZ	Pinnacle Studio HollywoodFX Plug-In Video Editing File (Pinnacle Systems, Inc.)
HG1	Hellgate: London Saved Game (Flagship Studios, Inc.)
HGC	PC Fold Molecule Secondary Structure
HGH	PDP-10 High Segment of a Two-Segment Program
HGH	Star Wars - Tie Fighter High Score
HGL	DN Highlight Groups Definition
HGL	HP Graphics Language (Plotter File)
HGP	HighGrow (Legal Marijuana Growing Game) Plant File (Slick Software)
HGS	HighGrow Virtual Seed File
HGT	Shuttle Radar Topography Mission Data (SRTM)
HH	C++ Header
HH	HammerHead Drumloop File
HH	Help Topic Map File
HHA	HyperHub Archive (Oracle)
HHC	HTML Help Table of Contents (Microsoft Corporation)
HHC	TurboTax Contents File (Intuit)
HHH	Power C Precompiled Header
HHK	HTML Help Index (Microsoft Corporation)
HHL	Visual Basic File
HHP	HTML Help Workshop Project (Microsoft Corporation)
HHS	HyperHub Subkit (Oracle)
HHS	HTML Help Samples (Microsoft Corporation)
HHTML	Realmedia Adstream HTML File
HI	High Scores
HI	Spy-CD CD Search Index File
HI1	Spy-CD CD Search Database File
HI2	Spy-CD CD Search Database File
HI4	Spy-CD CD Search Database File
HIA	Spy-CD CD Search Database File
HIB	Spy-CD CD Search Database File
HIC	Spy-CD CD Search Database File
HIC	HicEst Script (Georg Petrich, HicEst Instant Prototype Computing)
HID	Sony Ericsson Configuration Archive
HIF	Quicken On-line File (Intuit Inc.)
HIG	High Scores
HIGH	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIH	Spy-CD CD Search Database File
HIHAT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIL	Hi HelpIndex Language File
HIM	Spy-CD CD Search Database File
HIN	Spy-CD CD Search Database File
HIN	HyperChem Molecule File (Hypercube, Inc.)
HINT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HINTS	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HINTS2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIP	HiP Compressed File
HIP	Spy-CD CD Search Database File
HIPS	Bitmap Graphic
HIQ	Spy-CD CD Search Database File
HIR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIR	C64 Hires Bitmap Graphic
HIR	Hidden Icon Resource
HIR2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIS	DN History of Executing/Viewing/Editing
HIS	Insight II Dynamics Trajectory History File (Accelrys Software Inc.)
HIS	Spy-CD CD Search Database File
HIS	SOBEK Simulation History (WL | Delft Hydraulics)
HIST	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HISTORY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIT	Nonags Dialog Killer Data File
HIT	The Sims Sound File (Electronic Arts (Maxis))
HIT	HitPlayer Audio File
HIT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIV	RegShot Registry Hive File (TiANWEi)
HIV	W32/SillyFDC-AS
HIV	Windows NT Registry Hive (Microsoft Corporation)
HIW	Spy-CD CD Search Database File
HIX	System SYSUTIL File
HIZ	Spy-CD CD Search Database File
HJT	TreePad Hypertext Database File (Freebyte)
HK5	ACT! Database File (Best Software CRM Division)
HKC	HTML-KIT Auto Complete Short-cuts
HKI	WinHki Compressed Archive (Hanspeter Imp)
HKI1	WinHki Compressed File
HKI2	WinHki Compressed File
HKI3	WinHki Compressed File
HKS	HTML-Kit Plug-in (HTML-Kit.com)
HKT	egseing RB HK Data
HL$	Compressed DOS Help File (Microsoft Corporation)
HLB	VAX Help Library
HLD	Structural Desktop Saved Data (Hold File) (Structural Desktop, Inc.)
HLF	FAR Manager Help File (FAR Group)
HLF	BASIC QuickBAS QuickB01 File
HLI	MOJO 620 Logo (TDK)
HLL	Boulderdash Game File
HLM	Winhelp Vbhilfe File
HLN	MicroStation Hidden Line File (Bentley Systems, Incorporated)
HLP	Windows Help File (Microsoft Corporation)
HLP	HP-95LX Help File
HLP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
hlp	UNIX Help File
HLP	Advisor Help File (Microsoft Corporation)
HLP	Stata Statistical Software Help File (Stata Corporation)
HLX	ATI Radeon Video Driver Support File
HLX	Multi-Edit Help File
HLX	Hyperlatex File
HLX	Hollex Cartridge Atari Cartridge Image File
HLX	Visual C++ Syntax Coloring Instructions (Microsoft Corporation)
HLX	Help Magician Help Text File (Software Interphase, Inc.)
HLZ	Multi-Edit Packed Help File
HM	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HM	Windows Help Context IDs used by MAKEHM.EXE.
HM2	Help & Manual Ver 2 Help File Project (EC Software GmbH)
HM3	Help & Manual Ver 3 Help File Project (EC Software GmbH)
HMA	ATRAC3plus Encoded Audio File (Sony)
HME	Smartphone Theme File
HMF	HOOPS Metafile (Tech Soft America)
HMI	Descent Human Machine Interfaces MIDI File
HMK	Hallmark Card Studio File (Creative Home)
HMM	Procomm Plus Alternate Mail Read Option Menu
HMP	Help Magician Help Project File (Software Interphase, Inc.)
HMP	Frontier: First Encounters Music File
HMP	Descent Human Machine Interfaces MIDI File
HMP	Technics Sx KN 6000 Keyboard Home Page File
HMP	3D GameStudio Terrain Entity (Conitec Datasystems, Inc)
HMR	GeoTIFF Bitmap File (Bentley Systems, Incorporated)
HMS	HMS Archiware File
HMS	Stentura 8000 or Stentura 8000LX Deposition File
HMS	MS SMS Inventory File
HMSKIN	Help & Manual Ver 5 Help File Skin (EC Software GmbH)
HMT	HighMAT (Microsoft Corporation)
HMW	Homeword for DeskMate
HMX	MixlleniumEngine (Haydee) Web Server Module Template File
HMX	Help & Manual Ver 4 Help File Project (EC Software GmbH)
HMXP	Help & Manual Ver 5 Help File Uncompressed XML Project (EC Software GmbH)
HMXZ	Help & Manual Ver 5 Help File Compressed XML Project (EC Software GmbH)
HM~	Help&Manual Backup Help File Project
HNC	CNC Program File Heidenhain Dialog
HNC	NoteCenter Note File (Domas Savickas)
HND	HelpNDoc Project File (IBE Software)
HND	Hallo Northern Sky (HNSKY) Deep Sky Database File (Han Kleijn)
HNE	NoteCenter Encrypted Note File (Domas Savickas)
HNF	Humax Receiver Settings
HNS	Hallo Northern Sky (HNSKY) Settings (Han Kleijn)
HNV	TheWord & Bible Companion Hebrew Names Version Bible
HO	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HO	Magix Music/Video
HO	Knowledge Explorer Knowledge Representation Hierarchy Outline
HOB	Star Trek: Birth of the Federation Ship Graphic (Atari)
HOC	High Octane Race Course (Fishstick Games)
HOCKEY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOD	Homeworld Hardpoint/Object Data (Sierra Entertainment, Inc.)
HOF	Hall Of Fame
HOG	Descent Mission File
HOG	Lucas Arts Dark Forces WAD File
HOL	Personal Paint Dutch Language User Interface File (Amiga)
HOLES	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOLLY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOME	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOME1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOME2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOOD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOP	Hippon Protected File (Hippon SAS)
HOR	Horoscope
HORIZON1	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HORIZON2	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HORN	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HORNPIPE	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOT	Mosaic Internet Address
HOT	The Sims Sound File (Electronic Arts (Maxis))
HOT	eFax Messenger Fax (j2 Global Communications, Inc.)
HOTFONT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HOTSPOT	Homeworld Cursor Informaiton (Sierra Entertainment, Inc.)
HOW	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HP	Thor Database Primary Hash File
HP	HP Graphics Language (Plotter)
HP$	NTgraph Visual C Wizzard File
HP-	HP Distribution Binary File
HP-UX	HP-UNIX File
HP8	HP NewWave Write ASCII Roman8 Character Set
HP?	LoseThos C+ Header File (Terry A. Davis)
HPD	HotDocs PDF Document (Matthew Bender & Company, a member of the LexisNexis Group)
HPD	Harry Potter Related
HPD	HP Document (Hewlett-Packard Development Company, L.P.)
HPF	PageMaker HP LaserJet Font (Adobe Systems Incorporated)
HPF	HotLine Partial Download File
HPF	NetHelp2 Project File (Netscape)
HPG	Hide Photos Encrypted Photo Container (Bolide Software)
HPG	HP Graphics Language (Plotter)
HPGL	HP Graphics Language (Plotter)
HPH	Designer Graphics System2 File
HPI	Total Annihilation Saved Game
HPI	Hemera Photo-Object Image (Hemera Technologies Inc.)
HPI	GEM Font Information
HPIC	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HPJ	Visual Basic Help Project
HPJ	Help Project File
HPJ	HP LaserJet Print-to-File
HPK	Compressed Archive
HPK	HPXUpgrade Service Pack Fileset (Haliplex Communication Systems)
HPL	HP Graphics File
HPLJ	Hewlett-Packerd LaserJet Vector Image
HPM	Procomm Plus Alternate Main Menu for Privileged Users
HPM	Procomm Plus Alternative Menu
HPM	Quaestor 1.x High Performance Map
HPM	HP NewWave Emm Text
HPP	Zortech C++ Header
HPP	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HPP	C++ Builder 6 Program Header (Borland Software Corporation)
HPP	InfoMgr Database File (RESystems, Inc.)
HPP	Printer Control Language Vector Image (Hewlett-Packard)
HPP	C++ Program Header
HPPCL	Hewlett-Packard Printer Control Language Vector Image
HPR	RoboHELP Configuration File
HPR	ATLAS.ti 4.x Project File (Scientific Software Development)
HPR5	ATLAS.ti 5.0 Project File (Scientific Software Development)
HPRJ	Heroglyph Project File (proDAD GmbH)
HPRT	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HPS	HP HPS Digital Sender Information (Hewlett-Packard Development Company, L.P.)
HPT	HotDocs PDF Template (Matthew Bender & Company, a member of the LexisNexis Group)
HPUX	HP-UNIX File
HPW	CompuServe Home Page Wizard
HPW	HP Word Document (Hewlett-Packard Development Company, L.P.)
HP_	Winhelp Compressed File
HP~	V-help File
HQP	CP/M Disc Utility Information
hqx	Macintosh BinHex 4 Compressed Archive
HR	TRS 80 Graphic
HR2	Curious Labs Poser Hair File
HR5	Heredis 2000 Family History File (BSD CONCEPT)
HRC	SoftImage Model Geometry File
HRF	Hitachi Raster Format Graphic
HRH	C++ and Resources Common Header
HRL	Herolab EasyWin32
HRM	Netmino File
HRM	Procomm Plus Alternate Main Menu
HRP	AviSys Bird Watcher Database (Jerry Blinn)
HRP	Handy Recovery Recovered Partion Information (SoftLogica LLC.)
HRT	Hornet Packer Module/Song
HRU	HRU Bitmap
HRV	Personal Paint Croatian Language User Interface File (Amiga)
HRX	Herolab EasyWin32
HRZ	Slow Scan Television (SSTV)
HS	Literate Haskell Source Code File
HS	Hugs Source Code
HS	RAZR Flex File (Motorola, Inc.)
HS	HSnapshot Screen Snapshot (PCNetWork)
HS2	HyperRESEARCH (ResearchWare, Inc.)
HS2	Postering Monochrome Image
HS3	HyperRESEARCH (ResearchWare, Inc.)
HSA	Hagaki Studio Address Book (Microsoft Corporation)
HSB	HALion Sampler File (Steinberg Media Technologies GmbH.)
HSB	HandStory Suite eBook File (SJ NAMO, Inc.)
HSBOY	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HSC	HYSYS Simulation (Aspen Technology, Inc.)
HSC	HSC Tracker 2-op FM Music File
HSC	HelpScribble Project Source (JGsoft - Just Great Software)
HSD	Hagaki Studio Document (Microsoft Corporation)
HSD	HSD+CP Aero-HSD Configuration File (Thrane & Thrane)
HSE	Dreamweaver Snippet
HSF	HOOPS Stream File (Tech Soft America)
HSF	Lizard Protector Web Content Security Protected Web Content (LockLizard Limited)
HSH	IIS NNTP Hash File (Microsoft Corporation)
HSI	Handmade Software Graphic File
HSI	HSI JPEG Bitmap
HSK	Nimbus 7 SAMS Data File
HSM	Assembly Language Header - University of Waterloo Engineering Convention
HSM	The Sims Sound File (Electronic Arts (Maxis))
HSP	HomeSite WWW Page Project
HSP	HSC Packed
HSQ	CAST Application Mining Suite
HSQ	Data File Associated with Qaz Trojan
HSR	Hero Screen Recorder Screen Capture File (Beijing Herosoft Zongheng Network Technology Co., Ltd)
HSR	RezeptAssist Import and Export File
HSS	Dreamweaver Snippet
HSS	Photoshop Hue/Saturation Information (Adobe Systems Incorporated)
HST	WordPerfect (Corel Corporation)
HST	Yahoo! Instant Messenger History
HST	VGA Planets Game File (Tim Wisseman)
HST	Symantec Anti-Virus Live Update File (Symantec Corporation)
HST	Corel QuickCorrect and Speller History File
HST	Netscape History File
HST	Image Alchemy Handmade Software Graphics Histogram
HST	Host File
HST	History File
HST	Procomm Plus History File
HSX	Health and Safety Xpert Project (HBXL Construction Software)
HSZ	Handyscript Skin (Ventris, Inc.)
HT	HyperTerminal Data File (Hilgraeve Inc.)
HT	BrailleNote Visual Display File (Pulse Data International Ltd.)
HT	Browser Html Template (TechSoft)
HT3	HTML File
HTA	Hypertext Application
HTA	Tonline BSW4 File
HTA	Hemera Thumbnail Archive (Hemera Technologies Inc.)
HTACCESS	Apache Access Configuration
HTB	HttpBrowser Database File
HTC	HTML Component
HTD	HyperTRANSCRIBE Project File (ResearchWare, Inc.)
HTF	HTF Sounding File
HTF	Virtual Hypertext Font
HTF	WebBase File
HTI	WebBase File
HTI	Win Help Related File
HTM	Hypertext Markup Language
HTMENX	egis Encrypted HTM File (HiTRUST Inc.)
HTML	Hypertext Markup Language
HTML	Mozilla (Netscape) Bookmark File (Mozilla.org)
HTMLENX	egis Encrypted HTML File (HiTRUST Inc.)
HTMLS	Server-side HTML File
HTN	Micrografx Picture Publisher 8 printstyles file
HTP	honestech Video Editor Project File (Honest Technology,)
HTR	People Putty Haptek Character (Haptek, Inc.)
HTR	Motion Analysis Software Skeletal File
HTRI	HTRI Xchanger Suite Data Input File (Heat Transfer Research, Inc.)
HTS	Troj/DelSpy-E
HTT	Hypertext Template File (Microsoft Corporation)
HTX	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HTX	MS FrontPage Database Results HTML-like query script.
HTX	Extended Hypertext Template
HTZ	HTML Editor Archive
HU	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HUD	HUD Maker File (Radio Tree Productions, Inc.)
HUF	Huffman Encoded/Compressed File
HUH	HydroCAD Stormwater Modeling System Unit Hydrograph (HydroCAD Software Solutions LLC)
HULL	Halflife Map Collision Hull File
HUN	Dataview File
HUN	Personal Paint Hungarian Language User Interface File (Amiga)
HUS	Husqvarna Designer Embroidery Machine Format (Husqvarna Viking)
HUY	Eto Dlia Vas
HVA	Tiberian Sun Voxel Animation Control File (TiberiumSun.com)
HVD	HoverDesk Theme File (Hover Inc.)
HVD	ISIS Hviews File
HVD	HerdView Event Data File
HVD	CMT Surveyor's Assistant 1.x/2.0x Job
HVD	chosenOS HoverNews Skin File
HVX	LightWave 3D Hypervoxel (NewTek)
HW	Stanford University EPGY Homework
HWCFG	VersaPro Hardware Configuration File
HWD	Hollywood Presentation File
HWL	Hangman Deluxe Word List
HWL	Corel Shared Writing Tools 9.0 File
HWL	HttpWatch HTTP Watch Log (Simtec Limited)
HWM	Hillwalker/MapWise/Alpiniste/PhotoMaps Own Raster Map Parameters (ISYS Computers)
HWP	Hangul Word Processor File (Haansoft)
HWPROJ	Visual Studio .NET Help Project (Microsoft Corporation)
HWR	Hillwalker/MapWise/Alpiniste/PhotoMaps ISYS Route Card (ISYS Computers)
HX	SurRender3D Database File
HX	haXe Source Code (Motion-Twin)
HX	EARS Component File
HX	THOR Database Cross-reference Hash File
HXC	Help 2 Project/Collection File (Microsoft Corporation)
HXCONV	Huelix Audio Converter Session Information (Huelix Solutions Private Ltd)
HXD	Help 2 Validator File (Microsoft Corporation)
HXF	Help 2 Include File (Microsoft Corporation)
HXG	Help 2 Filter Cache (Microsoft Corporation)
HXH	Help 2 Merged Hierarchy (Microsoft Corporation)
HXI	Help 2 Compiled Help File (Microsoft Corporation)
HXK	Help TOC/Index File
HXK	Help 2 Keyword Index (Microsoft Corporation)
HXL	Help 2 Registered Namespaces List (Microsoft Corporation)
HXM	Descent2 HAM File
HXM	Procomm Plus Alternate Protocol Selection Menu for All Users
HXML	haXe Make File (Motion-Twin)
HXS	Help 2 Compiled Help File (Microsoft Corporation)
HXT	Help TOC/Index File
HXT	Help 2 Table of Contents (Microsoft Corporation)
HXV	Help 2 Virtual Topic Definition (Microsoft Corporation)
HXW	Help 2 Merged Keyword Index (Microsoft Corporation)
HXX	C++ Header
HX_	C Poet Compressed Disk1 File
HY1	Ventura Publisher Hyphenation Algorithm
HY2	Ventura Publisher Hyphenation Algorithm
HYC	WordPerfect Hyphenation File (Corel Corporation)
HYD	WordPerfect for Windows Hyphenation Dictionary (Corel Corporation)
HYM	Scandata 3D Scanner File (Hymarc, Inc.)
HYP	Hyper Compressed Archive
HYP	Hyphenation File
HYP	Atari ST Guide Hypertext Document
HYP	Acrobat Spelling File (Adobe Systems Incorporated)
HYPERCARD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HYPERXCMD	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HYPHENATOR	Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HYS	TriboIndenter Air Indent Electrostatic Force Constant Setting (Hysitron Incorporated)
HYS	Globe HySales Client File (Globe Interactive)
HYS	Multi-Parametric Toolbox HYSDEL File (Eidgenössische Technische Hochschule Zürich)
HYS	Smart Touch Analyze and Retrieve Tool (START) New Generation Operator Software Update (HySecurity)
HZ	Chinese Text
HZF	Home Inspector Pro Client Inspection (Home Inspection Software)
HZF	Neosat Fixes (Neosat USA)
HZO	CrossWorks Object File (Rowley Associates Limited)
HZX	CrossWorks Executable File (Rowley Associates Limited)
H_	Winhelp Compressed File
H__	C++ Header Seldom used C++ Header (same as H++ and H)