| File extension | Developer/Producer | File description |
|---|---|---|
| H file extension | N/A | C/C++ Header Format |
| H++ file extension | N/A | Unusual C++ Header |
| H-263 file extension | N/A | H.263 Encoded Video |
| H263 file extension | N/A | H.263 Encoded Video |
| H0 file extension | MAGIX | Movie Edit Pro Waveform Information Format |
| H00 file extension | ARM Holdings plc | ARM EPROM HEX |
| H01 file extension | ARM Holdings plc | ARM EPROM HEX |
| H04 file extension | General Electric Company | GE FIX32 Historical |
| H08 file extension | General Electric Company | GE FIX32 Historical |
| H10 file extension | H&R Block | At Home Canada 2010 Tax Return Format |
| H11 file extension | H&R Block Canada | At Home 2011 Tax Return Format |
| H12 file extension | H&R Block Canada | At Home 2012 Tax Return Format |
| H1C file extension | Microsoft Corporation | Windows Vista File Related To Assistance Platform (AP) Help |
| H1D file extension | N/A | Microsoft Windows |
| H1F file extension | Microsoft Corporation | Microsoft Windows Assistance Platform Client Help |
| H1H file extension | Microsoft Corporation | Microsoft Windows Merged Hierarchy Help |
| H1K file extension | Microsoft Corporation | Keyword Index - Microsoft Windows Assistance Platform Client Help Related |
| H1Q file extension | Microsoft | Microsoft Help Merged Query Index Format |
| H1S file extension | Microsoft | Microsoft Windows Assistance Platform Client Help Format |
| H1T file extension | Microsoft Corporation | Microsoft Windows Assistance Platform Client Help Related |
| H1V file extension | Microsoft Corporation | Task Metadata - Microsoft Windows Assistance Platform Client Help Related |
| H1W file extension | Microsoft Corporation | Microsoft Windows Keyword Index |
| H260 file extension | N/A | Video Recording |
| H261 file extension | N/A | H.261 Video Format |
| H263 file extension | N/A | H.263 Video Format |
| H264 file extension | N/A | H.264 Video Format |
| H2DRUMKIT file extension | Hydrogen Team | Hydrogen Drum Kit |
| H2O file extension | Liquid Entertainment | Battle Realms Game Data Format |
| H2P file extension | Urs Heckmann | Zebra Preset |
| H2SONG file extension | Hydrogen Team | Hydrogen Drum Notes |
| H2W file extension | N/A | H2testw |
| H3B file extension | Line 6, Inc. | POD HD300 Bundle |
| H3C file extension | The 3DO Company | Heroes Of Might And Magic 3 Campaign |
| H3D file extension | Altair Engineering, Inc. | Altair HyperView 3D Model |
| H3E file extension | Line 6, Inc. | POD HD300 Preset |
| H3M file extension | New World Computing | Heroes Of Might And Magic 3 Map Format |
| H4B file extension | Line 6, Inc. | POD HD400 Bundle |
| H4E file extension | Line 6, Inc. | POD HD400 Preset |
| H4M file extension | Capcom Co., Ltd. | Resident Evil Zero Game |
| H4R file extension | New World Computing | Heroes Of Might And Magic 4 Data Format |
| H5 file extension | N/A | Hierarchical Data Format Version 5 |
| H5E file extension | Line 6, Inc. | POD HD500 Preset |
| H5S file extension | Line 6, Inc. | POD HD500 Set |
| H86 file extension | ARM Holdings plc | CP/M |
| HA file extension | N/A | HA Compressed Archive |
| HAK file extension | BioWare | BioWare Aurora Engine |
| HAL file extension | HansaWorld | HansaWorld Enterprise HAL Code Format |
| HAM file extension | N/A | Descent 2 Resource Format |
| HAML file extension | Sublime HQ Pty Ltd | HTML Abstraction Markup Language |
| HANDLEBARS file extension | N/A | Handlebars Template |
| HANG file extension | Apple, Inc. | Apple Mac OS X Terminal |
| HAP file extension | Hamarsoft | HAP Compressed File Archive |
| HAR file extension | Rick Meyers | E-Sword Harmony Resource |
| HARDDISK file extension | N/A | Boxer For Mac Harddisk |
| HARX file extension | Rick Meyers | E-sword Harmony |
| HAS file extension | N/A | Haskell Script Format |
| HASH file extension | Guidance Software Inc. | EnCase Forensic Drive Image Hash |
| HAT file extension | Sony Corporation | Formula 1 Car Race 2001 Log Hat |
| HATHDL file extension | Hentai@Home Team | Hentai@Home Download |
| HAV file extension | Haenlein-Software | Video Recorder Video |
| HAZ file extension | Microsoft Studios | Microsoft Flight Texture |
| HBC file extension | Xceleon Technologies | HyperBac Compressed Archive Format |
| HBC2 file extension | Xceleon Technologies | HyperBac Compressed Archive |
| HBE file extension | Xceleon Technologies | HyperBac Compressed/encrypted Archive |
| HBK file extension | Mathsoft | Mathcad Handbook Format |
| HBM file extension | Hibernate Project | Hibernate Script |
| HBN file extension | Oracle Corporation | Java Hibernate |
| HBR file extension | Mario Carbajal | HaxBall Replay |
| HBX file extension | N/A | BinHex Encoded Format |
| HBZ file extension | Star Finanz GmbH | StarMoney Macro |
| HCB file extension | HyperOs Systems | HyperOS Compressed Backup |
| HCC file extension | HydroCAD Software Solutions | HydroCAD Storage Chamber Definition Format |
| HCE file extension | HydroCAD Software Solutions | HydroCAD Hydrograph Data Format |
| HCF file extension | Zaplots | Compact Ham Library |
| HCFG file extension | HoDoKu Team | HoDokK Configuration |
| HCG file extension | HCSoft Programación, s.l., | HClab Chart |
| HCI file extension | HydroCAD Software Solutions | HydroCAD IDF Data Format |
| HCL file extension | HotDocs | HotDocs Library Format |
| HCOM file extension | N/A | Sound Tools HCOM Audio |
| HCP file extension | HydroCAD Software Solutions | HydroCAD Project Format |
| HCR file extension | HydroCad Software Solutions | HydroCAD Stormwater Modeling System Rainfall Definition |
| HCS file extension | Health Canada | NHP ESubmission Builder Submission Package |
| HCT file extension | Symantec Corporation | Symantec Liveupdate |
| HCU file extension | HydroCAD Software Solutions | HydroCAD Hydrograph Units Definitions Format |
| HCW file extension | Microsoft Corporation | HTML Help Workshop Conversion Wizard Macro |
| HCX file extension | Harvard Graphics | Harvard ChartXL Chart Format |
| HD2 file extension | Smith Micro | Poser Hand Pose Format |
| HDA file extension | Matthew Bender & Company | HotDocs Document File Format |
| HDB file extension | HansaWorld | HansaWorld Enterprise Database Format |
| HDC file extension | Simpli Software Inc. | HD Tach Benchmark |
| HDD file extension | Parallels | Parallels Workstation Virtual Hard Disk Format |
| HDE file extension | Wagers & Associates, Inc. | NAUPA File Encryptor Encrypted |
| HDF file extension | N/A | Hierarchical Data Format |
| HDF4 file extension | The HDF Group | HDF4 |
| HDF5 file extension | The HDF Group | HDF5 |
| HDI file extension | Matthew Bender & Company | HotDocs Auto-install Format |
| HDK file extension | HotDocs | HotDocs Registration Format |
| HDL file extension | N/A | HotDocs Library Format |
| HDM file extension | Openwave | HDML Handheld Device Markup Language Format |
| HDML file extension | Openwave | Handheld Device Markup Language |
| HDMOV file extension | Apple | Apple QuickTime HD Movie Format |
| HDMP file extension | Microsoft | Microsoft Windows Heap Dump Format |
| HDP file extension | Microsoft | HD Photo |
| HDPMX file extension | HotDocs | HotDocs Publisher Mapping XML Format |
| HDR file extension | HDRsoft | High Dynamic Range Image Format |
| HDRP file extension | Ohanaware | HDRtist Graphic Format |
| HDRU file extension | N/A | Apollo HRDU Image Format |
| HDS file extension | Microsoft | Windows Digital Right Management Format |
| HDT file extension | Adobe Systems | Photoshop HDR Toning Preset Format |
| HDUMX file extension | HotDocs | HotDocs User Mapping XML Format |
| HDV file extension | JVC | High Definition Video Format |
| HDX file extension | Autodesk | Delphi MultiHelp Index Format |
| HDZ file extension | Smith Micro | Poser Compressed Hand Pose Format |
| HE4 file extension | The HDF Group | HDF4 |
| HEA file extension | Electronic Arts, Inc. | Fifa 2001 Data |
| HEARTSSAVE-MS file extension | Microsoft | Hearts Saved Game Format |
| HEB file extension | N/A | DEcomp 3D Scene Data |
| HED file extension | N/A | Hi-Eddi Image |
| HEF file extension | FrontRange Solutions USA Inc. | HEAT Export |
| HELP file extension | Apple | Unix Help Format |
| HELPCFG file extension | Adobe Systems Incorporated | Adobe AIR Help Configuration |
| HELPINDEX file extension | Mariner Software, Inc. | Mariner Software Narrator Index |
| HEP file extension | Novell, Inc. | Novell NetWare Help Librarian Data |
| HES file extension | N/A | TurboGrafx-16 Audio |
| HET file extension | SYNAMETIRCS | WinSQL HTML Export Template |
| HEU file extension | Adobe Systems Incorporated | Adobe Flash Player Cache Metadata |
| HEX file extension | N/A | Hex Dump Format |
| HF file extension | N/A | HF Image Format |
| HFA file extension | ERDAS, Inc. | Erdas Imagine Hierarchical |
| HFB file extension | David Peterson | Hell Fighter Battle |
| HFC file extension | H-JTAG team | H-JTAG Configuration |
| HFD file extension | HotDocs | HotDocs Form Document Format |
| HFMX file extension | N/A | HFM.NET Configuration |
| HFO file extension | Avid Technology, Inc. | Pinnacle Hollywood FX Object |
| HFP file extension | N/A | XnView Filter |
| HFS file extension | N/A | MacImage Macintosh HFS Disk Image Format |
| HFSS file extension | Ansoft | Ansoft HFSS Project |
| HFT file extension | HotDocs | HaftiX Cross-stitch Pattern |
| HFV file extension | Apple | Virtual Mac Hard Drive Format |
| HFX file extension | Harvard Graphics | Harvard Graphics F/X |
| HG file extension | N/A | HP Graphics Language |
| HG1 file extension | Electronic Arts, Inc. | Hellgate: London Saved Game |
| HGD file extension | N/A | IP Camera Video |
| HGH file extension | LucasArts Entertainment Company, LLC | Star Wars: Tie Fighter High Score |
| HGL file extension | Hewlett-Packard | Hewlett-Packard Graphics Language Format |
| HGP file extension | Slick Software | HighGrow Plant |
| HGS file extension | Harvard Graphics | Harvard Graphics Graphic |
| HGT file extension | N/A | Shuttle Radar Topography Mission Data SRTM Format |
| HGZ file extension | Esri | ArcMap GIS |
| HH file extension | N/A | C++ Header Format |
| HHC file extension | N/A | HTML Help Table Of Contents Format |
| HHH file extension | Power C | Power C Precompiled Header Format |
| HHK file extension | N/A | Microsoft HTML Help Index Format |
| HHL file extension | Microsoft Corporation | Visual Basic |
| HHP file extension | Microsoft Corporation | Microsoft HTML Help Project |
| HHPACK file extension | Stealth | HTC Home Extension |
| HHS file extension | Microsoft Corporation | Microsoft HTML Help Workshop Sample |
| HHSL file extension | Evert Etienne | Hockey High Score List Format |
| HHT file extension | Microsoft | Microsoft Help And Support Center HHT Format |
| HI file extension | The MAME Team | High Scores Format |
| HIC file extension | HicEst Instant Prototype Computing | HicEst Script |
| HID file extension | Sony Ericsson | Sony Ericsson Configuration Archive Format |
| HID2 file extension | N/A | KeepSafe Encrypted |
| HIF file extension | N/A | Quicken Online Format |
| HIL file extension | Mediamond | Deluxe Ski Jump 3 Hill |
| HIM file extension | Gravity Interactive Inc. | ROSE Online Highmaps |
| HIN file extension | Hypercube, Inc. | HyperChem HIN Chemical Modeller Input |
| HIP file extension | Side Effects Software | Houdini Project Format |
| HIPNC file extension | Side Effects Software | Houdini Apprentice Format |
| HIPS file extension | N/A | Bitmap |
| HIR file extension | N/A | Hires C64 Image Format |
| HIS file extension | PHDCC | FindinSite Database Definition Format |
| HISAWSAVE file extension | Her Interactive, Inc. | Nancy Drew Saved Game |
| HISF file extension | CSE | DL_POLY History |
| HISTORY file extension | The Eclipse Foundation | Eclipse IDE Local History |
| HISU file extension | CSE | DL_POLY History |
| HIT file extension | N/A | The Sims Sound Format |
| HIV file extension | Microsoft | Windows NT Registry Hive |
| HJT file extension | Freebyte.com | TreePad Editor Format |
| HKC file extension | HTML-Kit.com | HTML-KIT Auto Complete Short Cut |
| HKDB file extension | Apple | Apple ITunes Database Format |
| HKE file extension | Mindware Studios, s.r.o. | Painkiller Overdose Game |
| HKF file extension | Microsoft Corporation | Microsoft.NET Framework |
| HKI file extension | N/A | WinHKI Compressed Archive Format |
| HKI1 file extension | N/A | WinHKI HKI1 Compressed Archive Format |
| HKI2 file extension | N/A | WinHKI HKI2 Compressed Archive Format |
| HKI3 file extension | N/A | WinHKI HKI3 Compressed Archive Format |
| HKL file extension | N/A | RMCProfile Range Of Values |
| HKM file extension | Havok | Havok Movie Format |
| HKS file extension | HTML-Kit.com | HTML-KIT Plugin |
| HKX file extension | Bethesda Softworks LLC | Skyrim Animation |
| HL file extension | HeuristicLab | HeuristicLab Storage Format |
| HL$ file extension | N/A | MS-DOS Compressed Help |
| HL1 file extension | Valve Corporation | Half-Life Saved Game |
| HL6 file extension | WellSight Systems Inc. | Horizontal.Log 6 |
| HLA file extension | N/A | High Level Assembler Source |
| HLB file extension | N/A | VAX VMS Help Library Format |
| HLC file extension | European Southern Observatory | ESO MIDAS Help Command |
| HLD file extension | Structural Desktop, Inc. | Structural Desktop Hold |
| HLF file extension | Eugene Rosha | FAR Manager Help |
| HLK file extension | Relic Entertainment Inc. | Warhammer 40k Dawn Of War 2 Animation |
| HLN file extension | Bentley Systems, Incorporated | MicroStation Hidden Line |
| HLOG file extension | VMware, Inc. | VMware Workstation Log |
| HLP file extension | Microsoft | Help Format |
| HLQ file extension | European Southern Observatory | ESO MIDAS Help Qualifier |
| HLSL file extension | Microsoft | High Level Shader Language Source Code Format |
| HLT file extension | N/A | Watcher Database Trades List |
| HLW file extension | N/A | Win32/AMalum.EDHZ |
| HLX file extension | N/A | ATI Radeon Video Driver Format |
| HLZ file extension | Multi Edit Software Incorporated. | MultiEdit Packed Help |
| HM file extension | Microsoft Corporation | Windows Help Context IDs |
| HM0 file extension | MAGIX AG | MAGIX Audio Cleaning Lab Waveform |
| HM2 file extension | EC Software GmbH | Help & Manual Help File Project |
| HM3 file extension | N/A | Help & Manual Help File Project |
| HMA file extension | Sony | Sony MiniDisc Audio Format |
| HMAP file extension | N/A | Microsoft SharePoint Server 2007 Temporary |
| HMAPDIR file extension | N/A | Microsoft SharePoint Server 2007 Temporary |
| HMAX file extension | N/A | Custom 3ds Max Format |
| HMD file extension | Grassland, Soil & Water Research Laboratory | SWAT Relative Humidity Input |
| HME file extension | Microsoft | Smartphone Theme Format |
| HMF file extension | Tech Soft 3D | HOOPS Metafile |
| HMGD file extension | N/A | Microsoft Grammar |
| HMHD file extension | Microsoft Corporation | Word Hyphenation Format |
| HMI file extension | Human Machine Interfaces | HMI Audio Format |
| HMK file extension | Hallmark | Hallmark Card Studio Card Format |
| HML file extension | KS-Soft | HostMonitor TestList Format |
| HMMER file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM HMMER Format |
| HMMR file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM HMMR |
| HMP file extension | Team17 Software | Worms Height Map Format |
| HMS file extension | KS-Soft | HostMonitor Script Format |
| HMSD file extension | N/A | Microsoft Dictionary |
| HMSKIN file extension | EC Software GmbH | Help & Manual Help File Skin |
| HMT file extension | Microsoft and Panasonic | HighMAT Format |
| HMX file extension | N/A | Help & Manual Help File Project |
| HMXP file extension | EC Software | Help & Manual Help File Uncompressed XML Project |
| HMXZ file extension | EC Software | Help & Manual Help File Compressed XML Project |
| HMY file extension | Altuit, Inc. | Hemingway Content Management System Plugin |
| HM~ file extension | EC Software GmbH | Help&Manual Help Project Backup |
| HNC file extension | N/A | NoteCenter Note |
| HND file extension | Han Kleijn | HNSKY Deep Sky Database |
| HNF file extension | N/A | HNF Split & Merge Channels |
| HNR file extension | N/A | Teleatlas |
| HOB file extension | Microprose | Star Trek Birth Of The Federation Ship Graphic Data |
| HOD file extension | Relic Entertainment Inc. | Homeworld Object Data |
| HOG file extension | N/A | Descent Hog Format |
| HOGG file extension | Cryptic Studios, Inc. | Cryptic Studios Data |
| HOL file extension | Microsoft | Microsoft Outlook Holiday Calendar Format |
| HONMOD file extension | HON Modification Manager | Heroes Of Newerth Mod Format |
| HOP file extension | Hippon SAS | Hippon Protected |
| HOT file extension | Electronic Arts | The Sims Sound Format |
| HOTSPOT file extension | Relic Entertainment Inc. | Homeworld Cursor Informaiton |
| HP file extension | N/A | HP Graphics Language Plotter |
| HP1 file extension | N/A | HP Graphics Language Plotter |
| HP2 file extension | N/A | HP Graphics Language Plotter |
| HP? file extension | Terry A. Davis | LoseThos C+ Header |
| HPC file extension | Microsoft Corporation | System Dynamic Library |
| HPD file extension | HotDocs | HotDocs PDF Document Format |
| HPF file extension | N/A | High Performance FORTRAN Format |
| HPFS file extension | IBM | OS/2 High Performance File System |
| HPG file extension | Hewlett-Packard | HP Graphics Language Plotter Format |
| HPGL file extension | Hewlett-Packard | Hewlett Packard Graphics Language Plot Format |
| HPGL2 file extension | N/A | Hewlett Packard Graphics Language 2 |
| HPI file extension | Hemera | Hemera Photo Image Format |
| HPJ file extension | Microsoft | Microsoft Win Help Project Format |
| HPK file extension | N/A | HPack Compressed Archive Format |
| HPL file extension | Hewlett-Packard | Hewlett-Packard LaserJet Vector Image Format |
| HPLG file extension | Apple, Inc. | Apple ITunes Device Plugin |
| HPM file extension | Symantec Corporation | Procomm Plus Alternate Main Menu |
| HPO file extension | Paul F. Kunz | HippoDraw Canvas Document |
| HPP file extension | N/A | C++ Header Format |
| HPR file extension | Adobe Systems Incorporated | RoboHelp Settings |
| HPRJ file extension | proDAD Inc. | Heroglyph Project |
| HPROF file extension | N/A | Java Heap Dump |
| HPS file extension | Frictional Games | HPL2 Script |
| HPT file extension | HotDocs | HotDocs PDF Template Format |
| HPX file extension | MetaVR, Inc. | MetaVR 3D Model |
| HPZ file extension | Major Mind Software | Helpinator Project |
| HQF file extension | Cabin Logic LLC. | QuiltCAD Stitch |
| HQR file extension | Electronic Arts, Inc. | Little Big Adventure HQR |
| HQX file extension | N/A | Macintosh BinHex Archive |
| HR file extension | Tandy | TRS 80 Image File Format |
| HR2 file extension | Smith Micro | Poser Hair Format |
| HRC file extension | Autodesk, Inc. | Autodesk Softimage Model 3D |
| HRD file extension | MSC Software Corporation | MSC Patran Device-dependent Hardcopy |
| HRF file extension | Hitachi | Hitachi CADCore Raster Format |
| HRL file extension | Ericsson | Erlang Source Or Script Format |
| HRM file extension | Polar Electro | Polar ProTrainer Pulse Rate Save |
| HRS file extension | Wagers & Associates, Inc. | Holder Reporting System |
| HRU file extension | N/A | HRU Image Format |
| HRX file extension | Herolab GmbH | Herolab EasyWin32 |
| HRZ file extension | Smith Micro | Poser Compressed Hair Format |
| HS file extension | N/A | Literate Haskell Source Code Or Script Format |
| HS2 file extension | ResearchWare | HyperRESEARCH Postering Monochrome Image Format |
| HSB file extension | Steinberg Media Technologies | HALion Sampler Format |
| HSC file extension | Aspen Technology | Aspen HYSYS Simulation Format |
| HSE file extension | Adobe Systems Incorporated | Adobe Dreamweaver Snippet |
| HSF file extension | Tech Soft 3D | HOOPS Stream Format |
| HSH file extension | Microsoft | Windows Catalog Search Index Format |
| HSI file extension | Handmade Software | Handmade Software Bitmap Image |
| HSM file extension | Electronic Arts, Inc. | The Sims Sound |
| HSP file extension | N/A | HSC Composer Packed By Number Six |
| HSQL file extension | N/A | HtmSQL Html |
| HSR file extension | HS-Soft | RezeptAssist Import Or Export |
| HSS file extension | Adobe Systems Incorporated | Adobe Dreamweaver Snippet |
| HST file extension | N/A | Yahooo Messenger History Format |
| HSTX file extension | Altair Engineering, Inc. | Altair HyperStudy Package |
| HSV file extension | Blizzard Entertainment, Inc. | Diablo: Hellfire Singleplayer Character Data |
| HSX file extension | HBXL Construction Software | Health & Safety Xpert Project |
| HT file extension | Hilgraeve | HyperTerminal Session Format |
| HT1 file extension | Google Inc. | Google Desktop Application Data |
| HT4 file extension | N/A | HTML Version 4 |
| HTA file extension | Microsoft | HTML Program Format |
| HTACCESS file extension | N/A | Apache Access Configuration Format |
| HTB file extension | Audacity | Audacity Help Format |
| HTC file extension | Microsoft | HTML Component Format |
| HTD file extension | ResearchWare, Inc. | HyperTRANSCRIBE Project |
| HTG file extension | Chaozz Software | HackTheGame Mission Pack Format |
| HTGROUP file extension | Apache Software Foundation | Apache Server User Group |
| HTI file extension | Microsoft Corporation | Microsoft Windows WinHelp Related |
| HTK file extension | N/A | Hidden Markov Model Toolkit Speech Recognition |
| HTM file extension | N/A | HTML Hypertext Markup Language Web Page Format |
| HTML file extension | N/A | HTML Hypertext Markup Language Web Page Format |
| HTML0 file extension | N/A | Book Designer E-book Format |
| HTML5 file extension | N/A | HTML5 Hypertext Markup Language Revision 5 Source |
| HTMLENX file extension | Egis Technology Inc. | Egis Encrypted HTML |
| HTMLS file extension | N/A | HyperText Markup Language Document With Server-side Include |
| HTMLZ file extension | N/A | Zipped HTML Format |
| HTMS file extension | The PHP Group | PHP HTML Document |
| HTN file extension | Micrografx, Inc. | Micrografx Picture Publisher 8 Print Style |
| HTP file extension | Autodesk, Inc. | Autodesk Slope Template Definition |
| HTPASSWD file extension | N/A | Apache Password Format |
| HTPL file extension | IBM | IBM Rational Application Developer WebContent Theme |
| HTR file extension | Microsoft Corporation | Microsoft Windows NT Password Services Script |
| HTRI file extension | Heat Transfer Research, Inc. | HTRI Xchanger Suite Data Input |
| HTT file extension | Microsoft | Microsoft HyperText Template Format |
| HTW file extension | Microsoft Corporation | Windows |
| HTX file extension | Microsoft | Microsoft FrontPage Database Results |
| HTXT file extension | Hanvon | Hanvon WISEreader E-book Format |
| HTZ4 file extension | Bersoft | HyperMaker Publication Format |
| HTZ5 file extension | Bersoft | HyperMaker Document Format |
| HUD file extension | SmartWare Corporation | SmartWare Dictionary |
| HUH file extension | HydroCAD Software Solutions | HydroCAD Unit Hydrograph Definitions Format |
| HUL file extension | Acclaim Games Inc. | Re-Volt Collision Data |
| HULL file extension | Valve Corporation | Half-Life Map Collision Hull |
| HUN file extension | N/A | Personal Paint Hungarian Language User Interface |
| HUP file extension | Haihaisoft | Haihaisoft DRM-X Protected Video |
| HUS file extension | Viking | Husqvarna Embroidery Format |
| HUV file extension | Husqvarna Viking | Husqvarna Viking Designer Graphic |
| HV file extension | Microsoft Corporation | Microsoft Windows Mobile Hive |
| HVA file extension | Electronic Arts, Inc. | Command And Conquer Tiberian Sun Voxel Animation Control |
| HVC file extension | HotDocs | ASCII Format |
| HVD file extension | Thibaun Dijan | HoverDesk Theme |
| HVIF file extension | Haiku, Inc. | Haiku Vector Icon Format |
| HVL file extension | N/A | Commodore Amiga HivelyTracker Audio Module |
| HVPL file extension | Apple | Apple ITunes Visual Plugin Format |
| HWD file extension | Hedgewars Project | Hedgewars Game Replay Format |
| HWL file extension | Corel Corporation | Corel WordPerfect Shared Writing Tools 9.0 |
| HWMAP file extension | Hedgewars Project | Hedgewars Drawn Map Format |
| HWOF file extension | Microsoft Corporation | Microsoft Office For Mac Help |
| HWP file extension | Hancom | Hangul Document Format |
| HWS file extension | Hedgewars Project | Hedgewars Saved Game Format |
| HWT file extension | N/A | Huawei Ascend P6 Emotion UI Theme |
| HWX file extension | Rockwell Automation, Inc. | RSNetWorx Registration |
| HX file extension | Haxe.org | Haxe Source Code |
| HXA file extension | Microsoft | Microsoft Help Attribute Definition Format |
| HXC file extension | Microsoft | Microsoft Visual Studio Collection Definition Format |
| HXD file extension | Microsoft Corporation | Microsoft Help Validator |
| HXE file extension | Microsoft | Microsoft Help 2 Sample Definition Format |
| HXF file extension | Microsoft Corporation | Microsoft Help Include |
| HXH file extension | Microsoft Corporation | Microsoft Help Merged Hierarchy |
| HXI file extension | Microsoft Corporation | Microsoft Help Compiled Storage |
| HXK file extension | Microsoft | Microsoft Help 2 Keyword Index Format |
| HXL file extension | Microsoft Corporation | Microsoft Help Registered Namespace List |
| HXM file extension | N/A | Descent 2 Resource Modification Format |
| HXML file extension | Haxe.org | HaXe Make |
| HXN file extension | DAZ Productions | Hexagon Model Format |
| HXP file extension | Haxe.org | HaXe Project |
| HXPROJ file extension | FlashDevelop.org | FlashDevelop Flash Project |
| HXR file extension | Microsoft Corporation | Microsoft Help Data |
| HXS file extension | Microsoft | Microsoft Help Compiled Storage Format |
| HXT file extension | Microsoft | Help Table Of Contents Format |
| HXV file extension | Microsoft Corporation | Microsoft Help Virtual Topic Definition |
| HXW file extension | Microsoft Corporation | Microsoft Help Attribute Definition |
| HXX file extension | N/A | C++ Header Format |
| HY1 file extension | Corel Corporation | Ventura Publisher Hyphenation Algorithm |
| HY2 file extension | Corel Corporation | Ventura Publisher Hyphenation Algorithms |
| HYC file extension | Corel Corporation | Corel WordPerfect Data |
| HYD file extension | Corel Corporation | Corel WordPerfect Hyphenation Dictionary |
| HYDRA file extension | Adobe Systems | Hydra Image Filter Program Format |
| HYM file extension | N/A | Hymarc Scandata Scanner 3D Image Binary |
| HYP file extension | N/A | Hyper Compressed File Archive |
| HYPE file extension | Tumult | Hype Web Project Format |
| HYQ file extension | SINTEF | CARE-S InfoWorks Hydrograph |
| HYV file extension | HY-TEK Sports Software | Team Manager Meet Event Format |
| HZ file extension | N/A | Chinese (Hanzi) Text |
| HZD file extension | Halliburton | SeisWorks |
| H_ file extension | Microsoft Corporation | Microsoft Winhelp Compressed |
| H__ file extension | N/A | C++ Header |
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