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 Num Sym
.??_ Files ending in "_" are often compressed install files of the same
name (e.g., .EX_ expands to .EXE, .DL_ expands to .DLL, etc.)
.H Header (Usually C Compiler)
ADS Include File
.H1 Bruker Aspect NMR Data File
.H3M Game Map File (used by a large number of games)
.H4C Heroes of Might and Magic Map File
.H4R Possible Container for .MP3 Files (MUSIC.H4R)
.H! Flambeaux Tutorial Database
.H++ C++ Header File
.H-- Sphinx C-- Header File
.HA Compressed Archive
.HAD MixlleniumEngine (Haydee) Web Server Module Style File (XML format)
.HAF HEAT Archive File (Helpdesk software)
.HAK GameHack File (instruction codes to apply to memory to hack a game)
Neverwinter Nights File
.HAL Mortyr Archive [Dragon UnPACKer]
.HAM Image File
.HAN Viewpoint Headline Studio (Viewpoint used to be MetaCreations)
.HAP Compressed Archive
.HAT HAT (HOORA Analysis Tool) Model
.HAY MixlleniumEngine (Haydee) Web Server Module Content File (XML format)
.HBB HAHTtalk Object File (Japanese site)
.HBC Home Buyers Calculator Suite
.HBK Mathcad Handbook
Humanic Software Accounting Data
.HC BI/Suite Hypercube
.HCL Handwritten Claims Log (court claims record - unverified)
.HCM IBM HCM Configuration
.HCR IBM HCD/HCM Production Configuration
Half-fold Card File (Printmaster and others)
.HCT Symantec Anti-Virus Live Update File (usually LIVEUPDT.HCT)
.HD2 Curious Labs Poser Hand File
.HDA HotDocs Document
.HDB Nero File (CD burning/design software)
.HDC HelloDOC Medical Software File
.HDD HelloDOC Medical Software File
.HDF Hierarchical Data Format File
Help Development Kit Help File
.HDI AutoCAD Heidi Device Interface File
.HDI HelloDOC Medical Software File
.HDL Procomm Plus Alternate Download File Listing
.HDML Handheld Markup Language File (WAP phones; browser prior to 4.X)
.HDO Helpdesk-One File
.HDP Magix Music/Video
.HDR Procomm Plus Message Header
PC-File+ Database Header
Egret Data File
ArcInfo Binary [XnView]
Adobe Photoshop File
MicroSim PCBoard Hole-Drill Schedule Report
Apollo HDRU [XnView]
ArcView Header File (for ArcView extensions or TIF images)
.HDRU Apollo HDRU [XnView]
.HDW Harvard Draw Vector Graphics
.HDX Help Index (Various)
.HED HighEdit Document
Hi-Eddi [XnView]
ReliaSoft RG (Reliability Growth Analysis Software)
.HEH Scarlett Expert System Compiler Facts File (Scarlett is not presently available)
.HEL Microsoft Hellbender Saved Game
.HELI RealFlight Radio Control Aircraft Simulator Airplane Description
.HESSIAN Insight II Hessian File
.HESSIANX Insight II Hessian File
.HEX Hex Dump
Macintosh BinHex 2.0 File
HUGO Game File [Use HUGO Interpreter]
.HF HF File [XnView]
.HFI HP Font Info
.HFS Macintosh Disk Image on CD [FAQ]
.HFV Simulated Macintosh Volumes on PC Hard Drive [Executor] [HFVExplorer]
.HFX HotFax File
US Robotics Rapid Comm Voice Data File
.HFZ Pinnacle Studio Video Editing File
.HGH Star Wars - Tie Fighter High Score
.HGL HP Graphics Language (plotter) [SwiftView]
.HGS HighGrow Virtual Seed File
.HH C++ Header
Help Topic Map File
HammerHead Drumloop File
.HHC Table of Contents File (HHW Application)
TurboTax Contents File
.HHH Power C Precompiled Header
.HHK Help Workshop Index File
.HHP Procomm Plus Help Data
.HHP HTML Help Project
.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
.HIH Spy-CD CD Search Database File
.HIM Spy-CD CD Search Database File
.HIN HyperChem Molecule
Spy-CD CD Search Database File
.HIP Spy-CD CD Search Database File
.HIQ Spy-CD CD Search Database File
.HIR C64 Hires [XnView]
Hidden Icon Resource (no Web reference - used by one German developer)
.HIS Spy-CD CD Search Database File
Insight II Dynamics Trajectory History File
.HIT HitPlayer Audio File
Nonags Dialog Killer Data File
The Sims (Maxis) Sound File
.HIW Spy-CD CD Search Database File
.HIZ Spy-CD CD Search Database File
.HJT TreePad Hypertext Database File
.HK5 ACT! Contact Manager for Windows
.HLB VAX Help Library
.HLN Microstation Hidden Line File (unverified)
.HLP Windows Help File
Stata Statistical Software Help File [Text files whose format predates Windows]
HP-95LX Help File
.HLX Visual C++ Syntax Coloring Instructions
ATI Radeon Video Driver Support File
Hyperlatex File
Multi-Edit Help File
.HLZ Multi-Edit Packed Help File
.HM2 Help & Manual Help File Project
.HM3 Help & Manual Help File Project (ver 3)
.HMF Tech Soft America HOOPS Metafile (2D/3D visualization format
specifically tailored to the needs of displaying engineering data) [OpenHSF]
.HMI Descent Human Machine Interfaces MIDI File
.HMM Procomm Plus Alternate Mail Read Option Menu
.HMP Descent Human Machine Interfaces MIDI File
Technics Sx KN 6000 Keyboard Home Page File
Stateline Software Help Magician Pro Project
.HMS Stentura 8000 or Stentura 8000LX Deposition File (court record)
MS SMS Inventory File
HMS Archiware File (unverified)
.HMX MixlleniumEngine (Haydee) Web Server Module Template File (XML format)
.HM~ Help&Manual Backup Help File Project
.HNF Humax Receiver Settings
.HNV TheWord & Bible Companion Hebrew Names Version Bible
.HO Magix Music/Video
Knowledge Explorer Knowledge Representation Hierarchy Outline
.HOF Hall Of Fame (scores)
.HOG Lucas Arts Dark Forces WAD File
Descent Mission File [Dragon UnPACKer]
.HOR Horoscope (WINHORO.EXE) (unverified)
.HOT The Sims (Maxis) Sound File
.HP HP Graphics Language (plotter) [SwiftView]
.HP8 HP NewWave Write ASCII Roman8 Character Set
.HPD Harry Potter Related
.HPF PageMaker HP LaserJet Fonts
HotLine Partial Download File
.HPG HP Graphics Language (plotter) [SwiftView]
.HPGL HP Graphics Language (plotter) [SwiftView]
.HPI GEM Font Information
Hemera Photo-Object Image [XnView]
.HPJ Help Project File
.HPK Compressed Archive
.HPL HP Graphics File
.HPM Procomm Plus Alternative Menu
HP NewWave Emm Text
.HPP Borland C++ Builder 6 Program Header
InfoMgr Database File
Zortech C++ Header
.HPR RoboHELP Configuration File
.HQX Macintosh BinHex 4 Compressed Archive [Possibly use Basilisk II Emulator]
.HR TRS 80 Graphic [XnView]
.HR2 Curious Labs Poser Hair File
.HRC SoftImage Model Geometry File
.HRF Hitachi Raster Format Graphic
.HRL Herolab EasyWin32
.HRM Netmino File (SW under development Oct 2002)
Procomm Plus Alternate Main Menu (for those with limited abilities)
.HRU HRU File [XnView]
.HRX Herolab EasyWin32
.HRZ Slow Scan Television (SSTV) [XnView]
.HS Hugs Source Code
.HS2 Postering Monochrome Image
.HSC HelpScribble Project
.HSE Dreamweaver Snippet (pre-MX version)
.HSF Tech Soft America HOOPS Stream File (2D/3D visualization format
specifically tailored to the needs of displaying engineering data) [OpenHSF]
.HSH Microsoft IIS NNTP Hash File (Lists the Message IDs for all articles)
.HSI Handmade Software Graphic File
.HSK Nimbus 7 SAMS Data File (Daily ASCII files)
.HSM The Sims (Maxis) Sound File
.HSQ Data File Associated with Qaz Trojan
CAST Application Mining Suite (Query file to generate HTML from Database Server)
.HSR RezeptAssist Import and Export File
.HSS Photoshop Hue/Saturation Information
Dreamweaver Snippet (pre-MX version)
.HST History File
Netscape History File
Corel QuickCorrect and Speller History File
Procomm Plus History File
File Associated with WordPerfect (history?)
Symantec Anti-Virus Live Update File (usually LIVEUPDT.HST)
Yahoo Messenger History
Host File
.HT HyperTerminal
.HTA Hypertext Application (run apps from HTML doc)
Hemera Thumbnail Archive
.HTACCESS Apache Access Configuration File
.HTB HttpBrowser Database File
.HTC HTML Component (mechanism for implementing Dynamic HTML in script)
.HTF WebBase File
HTF Sounding File (link is PDF file)
Virtual Hypertext Font (TeX-based) [Basic Info]
.HTI WebBase File
.HTM Hypertext Markup Language (HTML)
.HTML Hypertext Markup Language (HTML)
.HTR Motion Analysis Software Skeletal File
.HTT Microsoft Hypertext Template
.HTX Extended Hypertext Template (Internet Database Connector File)
.HULL Halflife Map Collision Hull File
.HUS Husqvarna Designer I Embroidery Machine Format
[possibly read with Melco Sizer Software] (Pfaff Creative VIP Software)
Home Embroidery Format (Catalog using Designer's Gallery Studio)
.HUY Eto Dlia Vas
.HVD chosenOS HoverNews Skin File
ISIS Hviews File (chemical reaction database)
CMT Surveyor's Assistant 1.x/2.0x Job
HerdView Event Data File
.HWCFG VersaPro Hardware Configuration File
.HWD Hollywood Presentation File
.HWL Hangman Deluxe Word List
.HWP Hangul (Korean) Word Processor File
.HX EARS Component File (EARS = UK Liberal Democrats Election Agents Record System)
[Filename starts with E]
.HXK Help TOC/Index File
.HXM Procomm Plus Alternate Protocol Selection Menu
Descent2 HAM File
.HXS Help 2 File (replacement for .CHM)
.HXT Help TOC/Index File
.HXX C++ Header
.HY1 Ventura Publisher Hyphenation Algorythm
.HY2 Ventura Publisher Hyphenation Algorythm
.HYC WordPerfect Hyphenation File
.HYD WordPerfect for Windows Hyphenation Dictionary
.HYP Hypertext File
Hyphenation File
Acrobat Spelling File
Hyper Compressed Archive
.HZ Chinese