Collector: Nosa Lee
Original Address: https://www.seeksunslowly.com/file-extensions-types-references-h
To reprint this article, please indicate the source, thank you.
_____________________________________

Now, I collected all the known file extensions/types for your reference, I grouped them according to the first character due to there are too many file extensions/types.

The following file extensions/types are grouped as H*, to refer to more file extensions/types or download them (a compressed txt file that separates the extension and description with ” : “), please click the following links.

A B C D E F G H I J K L M N

O P Q R S T U V W X Y Z
Number  Symbol

Download All File Types/Extensions in ONE Compressed File

H   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
H   Header
H   ADS Include File (Autodesk, Inc.)
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   Water Web Program File (Clear Methods, Inc.)
H2O   H2OMAP Water Master Project File (MWH Soft)
H2O   Liquid Entertainment H2O Compressed Archive (Liquid Entertainment)
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   GameHack File
HAK   BioWare Aurora Engine File (BioWare Corp.)
HAK   Neverwinter Nights File
HAL   Mortyr Archive
HAL   Hyper Access Lite OS/2 Data File
HAL   Enterprise ERP system Source code files (HansaWorld)
HALOGEN   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HAM   Novell NetWare Disk Drivers NPA
HAM   Amiga Hold and Modify Image (Amiga, Inc.)
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   Formula 1 Car Race 2001 Log Hat File
HAT   HAT (HOORA Analysis Tool) Model
HAV   Video Recorder Video File
HAY   MixlleniumEngine (Haydee) Web Server Module Content File
HAZ   Train Simulator Hazard File (Microsoft Corporation)
HAZ   Flight Simulator Texture File (Microsoft Corporation)
HBB   HAHTtalk Object File
HBC   HyperBac Compressed File (HyperBac Technologies, Inc.)
HBC   Home Buyers Calculator Suite
HBC2   HyperBac Compressed File (HyperBac Technologies, Inc.)
HBE   HyperBac Compressed/Encrypted File (HyperBac Technologies, Inc.)
HBI   Handy Backup Backup Index File (Novosoft LLC)
HBK   MathCAD Handbook (Mathsoft Engineering & Education Inc.)
HBK   Hex Workshop Hex Editor Bookmark File (BreakPoint Software, Inc.)
HBK   Auto Backup Backup Archive (Han-soft Software)
HBK   HandyCafe Database File (Ates Software)
HBK   Humanic Software Accounting Data
HBM   Hotline Book Mark (Hotsprings Inc.)
HBX   Starmoney Macro file
HBZ   Starmoney Macro file
HC   High Resolution Cantone TIFF Bitmap
HC   Header File
HC   BI/Suite Hypercube
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 Programaci髇, 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   Nero HD-Backup (Nero AG)
HDB   ACT! History File (Best Software CRM Division)
HDC   HelloDOC Medical Software File (IMAGINE 蒬itions)
HDC   HD Tach Benchmark File (Simpli Software Inc.)
HDD   HelloDOC Medical Software File (IMAGINE 蒬itions)
HDD   Parallels Desktop for Mac Hard Disk Drive Image (Parallels, Inc.)
HDF   Hierarchical Data Format File
HDF   Procomm Plus Alternate Download File Listing
HDF   Amiga Hardfile Image
HDF   Help Development Kit Help File
HDI   AutoCAD Heidi Device Interface (Autodesk, Inc.)
HDI   HotDocs Auto-Install File (Matthew Bender & Company, a member of the LexisNexis Group)
HDI   HelloDOC Medical Software File (IMAGINE 蒬itions)
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   Procomm Plus Alternate Download File Listing
HDL   Giza Specifier Hidden Line Drawings (20-20 Technologies)
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   Photomatix HDR Image (HDRsoft)
HDR   Photoshop (Adobe Systems Incorporated)
HDR   Procomm Plus Message Header
HDR   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HDR   PC-File+ Database Header
HDR   MicroSim PCBoard Hole-Drill Schedule Report
HDR   Egret Data File
HDR   ArcView Header File (ESRI)
HDR   InstallShield Setup Header (Acresso Software Inc.)
HDR   Apollo HDRU
HDR   ArcInfo Binary (Environmental Systems Research Institute, Inc. (ESRI))
HDR   Radiance HDR Graphics Data
HDRU   Apollo HDRU
HDS   Hierarchical Data System
HDS   XMap Hierarchical Dataset (Delorme)
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   HighEdit Document
HED   Hi-Eddi
HED   ReliaSoft RG
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   UNIX Help File
HELP   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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)
HEM   HexEdit HexEdit (Expert Commercial Software)
HEP   HostExplorer Telnet Session Profile (Hummingbird Ltd.)
HEP   Novell NetWare Help Librarian Data File
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   Hex Dump
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   Smart Touch Analyze and Retrieve Tool (START) Classic Operator Software Update (HySecurity)
HEX   Macintosh BinHex 2.0 File
HEX   SPLITGRADE Upgrade File (Heiland electronic GmbH)
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   Hell Fighter Battle File (David Peterson)
HFB   Ralcgm File
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   HotDocs Form Template (Matthew Bender & Company, a member of the LexisNexis Group)
HFT   HaftiX Cross-Stitch Pattern (GRZELA Grzegorz Zochowski)
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   HotFax Fax (Smith Micro Software)
HFX   Hollywood FX Special Effects File (Pinnacle Systems, Inc.)
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   Star Wars – Tie Fighter High Score
HGH   PDP-10 High Segment of a Two-Segment Program
HGL   HP Graphics Language (Plotter File)
HGL   DN Highlight Groups Definition
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   Spy-CD CD Search Index File
HI   High Scores
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   HicEst Script (Georg Petrich, HicEst Instant Prototype Computing)
HIC   Spy-CD CD Search Database File
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   Hidden Icon Resource
HIR   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIR   C64 Hires Bitmap Graphic
HIR2   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HIS   Insight II Dynamics Trajectory History File (Accelrys Software Inc.)
HIS   DN History of Executing/Viewing/Editing
HIS   SOBEK Simulation History (WL | Delft Hydraulics)
HIS   Spy-CD CD Search Database File
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   HitPlayer Audio File
HIT   Nonags Dialog Killer Data File
HIT   The Sims Sound File (Electronic Arts (Maxis))
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   Advisor Help File (Microsoft Corporation)
HLP   Windows Help File (Microsoft Corporation)
HLP   Stata Statistical Software Help File (Stata Corporation)
HLP   HP-95LX Help File
HLP   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
hlp   UNIX Help File
HLX   ATI Radeon Video Driver Support File
HLX   Hollex Cartridge Atari Cartridge Image File
HLX   Visual C++ Syntax Coloring Instructions (Microsoft Corporation)
HLX   Multi-Edit Help File
HLX   Hyperlatex File
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   Technics Sx KN 6000 Keyboard Home Page File
HMP   3D GameStudio Terrain Entity (Conitec Datasystems, Inc)
HMP   Descent Human Machine Interfaces MIDI File
HMR   GeoTIFF Bitmap File (Bentley Systems, Incorporated)
HMS   MS SMS Inventory File
HMS   Stentura 8000 or Stentura 8000LX Deposition File
HMS   HMS Archiware 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   Lucas Arts Dark Forces WAD File
HOG   Descent Mission 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   HP Document (Hewlett-Packard Development Company, L.P.)
HPD   HotDocs PDF Document (Matthew Bender & Company, a member of the LexisNexis Group)
HPD   Harry Potter Related
HPF   HotLine Partial Download File
HPF   NetHelp2 Project File (Netscape)
HPF   PageMaker HP LaserJet Font (Adobe Systems Incorporated)
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   GEM Font Information
HPI   Hemera Photo-Object Image (Hemera Technologies Inc.)
HPIC   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HPJ   Help Project File
HPJ   HP LaserJet Print-to-File
HPJ   Visual Basic Help Project
HPK   HPXUpgrade Service Pack Fileset (Haliplex Communication Systems)
HPK   Compressed Archive
HPL   HP Graphics File
HPLJ   Hewlett-Packerd LaserJet Vector Image
HPM   Quaestor 1.x High Performance Map
HPM   Procomm Plus Alternate Main Menu for Privileged Users
HPM   HP NewWave Emm Text
HPM   Procomm Plus Alternative Menu
HPP   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
HPP   C++ Builder 6 Program Header (Borland Software Corporation)
HPP   C++ Program Header
HPP   Printer Control Language Vector Image (Hewlett-Packard)
HPP   InfoMgr Database File (RESystems, Inc.)
HPP   Zortech C++ Header
HPPCL   Hewlett-Packard Printer Control Language Vector Image
HPR   ATLAS.ti 4.x Project File (Scientific Software Development)
HPR   RoboHELP Configuration File
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   HP Word Document (Hewlett-Packard Development Company, L.P.)
HPW   CompuServe Home Page Wizard
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   RAZR Flex File (Motorola, Inc.)
HS   HSnapshot Screen Snapshot (PCNetWork)
HS   Literate Haskell Source Code File
HS   Hugs Source Code
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   HSC Tracker 2-op FM Music File
HSC   HYSYS Simulation (Aspen Technology, Inc.)
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   Lizard Protector Web Content Security Protected Web Content (LockLizard Limited)
HSF   HOOPS Stream File (Tech Soft America)
HSH   IIS NNTP Hash File (Microsoft Corporation)
HSI   Handmade Software Graphic File
HSI   HSI JPEG Bitmap
HSK   Nimbus 7 SAMS Data File
HSM   The Sims Sound File (Electronic Arts (Maxis))
HSM   Assembly Language Header – University of Waterloo Engineering Convention
HSP   HSC Packed
HSP   HomeSite WWW Page Project
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   Photoshop Hue/Saturation Information (Adobe Systems Incorporated)
HSS   Dreamweaver Snippet
HST   Procomm Plus History File
HST   Image Alchemy Handmade Software Graphics Histogram
HST   Host File
HST   Yahoo! Instant Messenger History
HST   Netscape History File
HST   History File
HST   Corel QuickCorrect and Speller History File
HST   WordPerfect (Corel Corporation)
HST   Symantec Anti-Virus Live Update File (Symantec Corporation)
HST   VGA Planets Game File (Tim Wisseman)
HSX   Health and Safety Xpert Project (HBXL Construction Software)
HSZ   Handyscript Skin (Ventris, Inc.)
HT   BrailleNote Visual Display File (Pulse Data International Ltd.)
HT   Browser Html Template (TechSoft)
HT   HyperTerminal Data File (Hilgraeve Inc.)
HT3   HTML File
HTA   Tonline BSW4 File
HTA   Hypertext Application
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   Win Help Related File
HTI   WebBase File
HTM   Hypertext Markup Language
HTMENX   egis Encrypted HTM File (HiTRUST Inc.)
HTML   Mozilla (Netscape) Bookmark File (Mozilla.org)
HTML   Hypertext Markup Language
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   Personal Paint Hungarian Language User Interface File (Amiga)
HUN   Dataview File
HUS   Husqvarna Designer Embroidery Machine Format (Husqvarna Viking)
HUY   Eto Dlia Vas
HVA   Tiberian Sun Voxel Animation Control File (TiberiumSun.com)
HVD   ISIS Hviews File
HVD   chosenOS HoverNews Skin File
HVD   HoverDesk Theme File (Hover Inc.)
HVD   HerdView Event Data File
HVD   CMT Surveyor’s Assistant 1.x/2.0x Job
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   HttpWatch HTTP Watch Log (Simtec Limited)
HWL   Corel Shared Writing Tools 9.0 File
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   THOR Database Cross-reference Hash File
HX   haXe Source Code (Motion-Twin)
HX   EARS Component File
HX   SurRender3D Database 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 2 Keyword Index (Microsoft Corporation)
HXK   Help TOC/Index File
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 2 Table of Contents (Microsoft Corporation)
HXT   Help TOC/Index File
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   Hyphenation File
HYP   Atari ST Guide Hypertext Document
HYP   Acrobat Spelling File (Adobe Systems Incorporated)
HYP   Hyper Compressed Archive
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   Smart Touch Analyze and Retrieve Tool (START) New Generation Operator Software Update (HySecurity)
HYS   Multi-Parametric Toolbox HYSDEL File (Eidgen鰏sische Technische Hochschule Z黵ich)
HYS   Globe HySales Client File (Globe Interactive)
HYS   TriboIndenter Air Indent Electrostatic Force Constant Setting (Hysitron Incorporated)
HZ   Chinese Text
HZF   Neosat Fixes (Neosat USA)
HZF   Home Inspector Pro Client Inspection (Home Inspection Software)
HZO   CrossWorks Object File (Rowley Associates Limited)
hzp   Hazard Manager Document (APPinspect inc.)
HZX   CrossWorks Executable File (Rowley Associates Limited)
H_   Winhelp Compressed File
H__   C++ Header Seldom used C++ Header (same as H++ and H)

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