.??_ 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)
.H3M Game Map File (used by a large number of games)
.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)
.HAK GameHack File (instruction codes to apply to memory to hack a game)
.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)
.HBC Home Buyers Calculator Suite
.HBK Mathcad Handbook
Humanic Software Accounting Data
.HC BI/Suite Hypercube
.HCM IBM HCM Configuration
.HCR IBM HCD/HCM Production Configuration
.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)
.HDF Hierarchical Data Format File
Help Development Kit Help File
.HDL Procomm Plus Alternate Download File Listing
.HDML Handheld Markup Language File (WAP phones; browser prior to 4.X)
.HDP Magix Music/Video
.HDR Procomm Plus Message Header
PC-File+ Database Header
Egret Data File
ArcInfo Binary [XnView]
Adobe Photoshop File
Apollo HDRU [XnView]
.HDRU Apollo HDRU [XnView]
.HDW Harvard Draw Vector Graphics
.HDX Help Index (Various)
.HED HighEdit Document
Hi-Eddi [XnView]
.HEH Scarlett Expert System Compiler Facts File (Scarlett is not presently available)
.HEL MS Hellbender Saved Game
.HEX Hex Dump
Macintosh BinHex 2.0 File
.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
.HIN HyperChem Molecule
.HIR C64 Hires [XnView]
.HIT HitPlayer Audio File
Nonags Dialog Killer Data File
The Sims (Maxis) Sound File
.HJT TreePad Hypertext Database File
.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]
.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
.HMI Descent Human Machine Interfaces MIDI File
.HMM Procomm Plus Alternate Mail Read Option Menu
.HMP Descent Human Machine Interfaces MIDI File
.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
.HOF Hall Of Fame (scores)
.HOG Lucas Arts Dark Forces WAD File
Descent Mission File [Dragon UnPACKer]
.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
.HPR RoboHELP Configuration File
.HQX Binhex Text Conversion File (Macintosh)
WinXP Game File (sorry no details were in the submission)
.HR2 Curious Labs Poser Hair File
.HRF Hitachi Raster Format Graphic
.HRL Herolab EasyWin32
.HPM Procomm Plus Alternate Main Menu
.HPP Zortech C++ Header
.HPR RoboHelp Configuration
.HQX Macintosh BinHex 4 Compressed Archive
.HR TRS 80 Graphic [XnView]
.HRM Procomm Plus Alternate Main Menu
.HRU HRU File [XnView]
.HRX Herolab EasyWin32
.HRZ Slow Scan Television [XnView]
.HS Hugs Source Code
.HS2 Postering Monochrome Image
.HSC HelpScribble Project
.HSE Dreamweaver Snippet (pre-MX version)
.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)
.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)
Host File
.HT HyperTerminal
.HTA Hypertext Application (run apps from HTML doc)
Hemera Thumbnail Archive
.HTACCESS Apache Access Configuration File
.HTC HTML Component (mechanism for implementing Dynamic HTML in script)
.HTF WebBase File
.HTI WebBase File
.HTM Hypertext Markup Language (HTML)
.HTML Hypertext Markup Language (HTML)
.HTT Hypertext Template
.HTX Extenended 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]
.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]
.HXM Procomm Plus Alternate Protocol Selection Menu
Descent2 HAM File
.HXS Help 2 File (replacement for .CHM)
.HXX C++ Header
.HY1 Ventura Publisher Hyphenation Algorythm
.HY2 Ventura Publisher Hyphenation Algorythm
.HYC WordPerfect Hyphenation File
.HYD WordPerfect Hyphenation Dictionary
.HYP Hypertext File
Hyphenation File
Acrobat Spelling File
Compressed Archive
.HZ Chinese
