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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .H11 | H&R Block | Data Files | At Home Canada 2011 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .H12 | H&R Block | Data Files | At Home Canada 2012 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .H13 | H&R Block | Data Files | H&R Block Canada 2013 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .H14 | H&R Block | Data Files | H&R Block Canada 2014 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .H15 | H&R Block | Data Files | H&R Block Canada 2015 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .H16 | H&R Block | Data Files | H&R Block Canada 2016 Tax Return | Intuit TurboTax | Intuit, Inc. |
| .H17 | H&R Block | Data Files | H&R Block Canada 2017 Tax Return | H&R Block Tax Software | H&R Block |
| .H2O | Liquid Entertainment | Data Files | Battle Realms Game Data File | Total Commander | Ghisler Software GmbH |
| .H2W | Harald Bögeholz | Data Files | H2testw File | H2testw | Harald Bögeholz |
| .H5 | The HDF Group | Data Files | Hierarchical Data Format 5 File | GDAL | Open Source |
| .HAL | HansaWorld | Data Files | HansaWorld Enterprise HAL Code File | HansaWorld Enterprise | HansaWorld |
| .HAR | Rick Meyers | Data Files | E-Sword Harmony Resource File | e-Sword | Rick Meyers |
| .HARP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HASH | OpenText | Data Files | EnCase Forensic Drive Image Hash | EnCase Forensic | OpenText |
| .HAZ | Microsoft Corporation | Data Files | Microsoft Flight Simulator Texture File | Microsoft Flight Simulator | Microsoft Corporation |
| .HCA | Empirix Inc | Data Files | Hammer Call Analyzer Network Traffic Data | Hammer Call Analyzer | Empirix Inc |
| .HCC | HydroCAD Software Solutions | Data Files | HydroCAD Prefab Chamber Data File | HydroCAD | HydroCAD Software Solutions |
| .HCE | HydroCAD Software Solutions | Data Files | HydroCAD Hydrograph Data | HydroCAD | HydroCAD Software Solutions |
| .HCF | Zaplots Games, Inc. | Data Files | Compact Ham Library | Zaplots HAM Runtime | Zaplots Games, Inc. |
| .HCI | HydroCAD Software Solutions | Data Files | HydroCAD IDF Data | HydroCAD | HydroCAD Software Solutions |
| .HCL | Matthew Bender | Data Files | HotDocs Clause Archive | HotDocs | Matthew Bender |
| .HCT | Symantec Corporation | Data Files | Symantec LiveUpdate Data | Norton Security | Symantec Corporation |
| .HCU | HydroCAD Software Solutions | Data Files | Hydrograph Units Definitons File | HydroCAD | HydroCAD Software Solutions |
| .HCW | Microsoft Corporation | Data Files | HTML Help Workshop Conversion Wizard Macro File | Microsoft HTML Help Workshop | Microsoft Corporation |
| .HCX | Harvard Graphics | Data Files | Harvard ChartXL Chart | Harvard Graphics ChartXL | Harvard Graphics |
| .HD | Shark007 | Data Files | VistaCodecs Data | VistaCodecs | Shark007 |
| .HDA | Matthew Bender | Data Files | HotDocs Auto-Assemble File | HotDocs | Matthew Bender |
| .HDB | HansaWorld | Data Files | HansaWorld Database File | HansaWorld Enterprise | HansaWorld |
| .HDC | TCD Labs | Data Files | HD Tach Benchmark Results | HD Tach | TCD Labs |
| .HDD | Parallels | Data Files | Parallels Desktop Hard Disk File | Parallels Desktop for Mac | Parallels |
| .HDI | Open Source | Data Files | Hard Disk Image | Anex86 | Open Source |
| .HDL | Matthew Bender | Data Files | HotDocs Library File | HotDocs | Matthew Bender |
| .HDS | Parallels | Data Files | Parallels Desktop Hard Disk File | Parallels Desktop for Mac | Parallels |
| .HDT | Adobe Systems Incorporated | Data Files | Photoshop HDR Toning Preset File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .HDV | JVCKenwood Group | Data Files | High Definition Video Format | MAGIX Vegas | Magix Software GmbH |
| .HE5 | The HDF Group | Data Files | Hierarchical Data Format Release 5 | The HDF Group HDFView | The HDF Group |
| .HEAD | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEADER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEC | Unknown Developer | Data Files | Grafic Pvquan Quant File | Unknown Software | Unknown Developer |
| .HELPER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEP | Novell, Inc. | Data Files | Help Librarian Data | NetWare | Novell, Inc. |
| .HESSIAN | Accelrys Software Inc. | Data Files | Insight II Hessian File | Insight II | Accelrys Software Inc. |
| .HEY | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HFO | Avid Technology | Data Files | Pinnacle Hollywood FX Object | Pinnacle Hollywood FX | Avid Technology |
| .HFX | Smith Micro Software | Data Files | HotFax Data File | HotFax | Smith Micro Software |
| .HGC | Unknown Developer | Data Files | PC Fold Data | PC Fold | Unknown Developer |
| .HGP | Slick Software | Data Files | HighGrow Plant File | HighGrow | Slick Software |
| .HIF | Quicken | Data Files | Quicken Online File | Intuit Quicken | Quicken |
| .HIGH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HIN | Hypercube, Inc. | Data Files | HyperChem Input File | Avogadro | Open Source |
| .HINT | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .HIST | MicroStrategy Inc | Data Files | MicroStrategy History Data | MicroSrategy | MicroStrategy Inc |
| .HIX | Page Technology Marketing, Inc | Data Files | PCLTool Low Level Index File | PCLTool | Page Technology Marketing, Inc |
| .HJT | Freebyte | Data Files | TreePad 6 Database File | Treepad | Freebyte |
| .HKL | Interscape | Data Files | RMCProfile Range Of Values Data | RMCProfile | Interscape |
| .HKT | Havok (Telekinesys Research Ltd.) | Data Files | Havok Tagfile | Havok | Havok (Telekinesys Research Ltd.) |
| .HL7 | Real Seven | Data Files | HL7 Standard Format Data | 7Edit | Real Seven |
| .HLB | Hewlett-Packard | Data Files | VMS / VAX Help Library | OpenVMS | Hewlett-Packard |
| .HLF | Eugene Roshal | Data Files | FAR Manager Help Data | Far Manager | Eugene Roshal |
| .HLG | BMERC | Data Files | BMERC Homolog File Format | Unknown Software | Unknown Developer |
| .HLSLI | Microsoft Corporation | Data Files | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .HLT | Unknown Developer | Data Files | Watcher Database Trades List File | Watcher Database | Unknown Developer |
| .HLW | Unknown Developer | Data Files | Win32/AMalum.EDHZ Data | Unknown Software | Unknown Developer |
| .HLX | Advanced Micro Devices, Inc. | Data Files | ATI Radeon Video Driver Support File | ATI Catalyst | Advanced Micro Devices, Inc. |
| .HLZ | European Southern Observatory | Data Files | ESO MIDAS Help ASCII File | ESO-MIDAS | European Southern Observatory |
| .HM3 | EC Software | Data Files | Help & Manual Help File Project | Help & Manual | EC Software |
| .HML | Advanced Network Software | Data Files | HostMonitor TestList File | HostMonitor | Advanced Network Software |
| .HMM | Sean Eddy | Data Files | HMMER Data | HMMER | Sean Eddy |
| .HMT | Microsoft Corporation | Data Files | HighMAT File | Microsoft Windows Media Player | Microsoft Corporation |
| .HMXP | EC Software | Data Files | Help & Manual XML Project | Help & Manual | EC Software |
| .HMXZ | EC Software | Data Files | Help & Manual Compressed Project | Help & Manual | EC Software |
| .HND | Han Kleijn | Data Files | HNSKY Deep Sky Database File | HNSKY | Open Source |
| .HNL | Unknown Developer | Data Files | Hunter MFC Data | Unknown Software | Unknown Developer |
| .HNV | Costas stergiou | Data Files | TheWord & Bible Companion Hebrew Names Version Bible | theWord | Costas stergiou |
| .HO | Open Source | Data Files | Knowledge Explorer Knowledge Representation Hierarchy Outline | my Knowledge Explorer | Open Source |
| .HOBO | Onset | Data Files | Onset Hobo Data Logger File | HOBOware | Onset |
| .HOL | Microsoft Corporation | Data Files | Outlook Holidays File | Microsoft Outlook 2016 | Microsoft Corporation |
| .HOLLY | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .HOR | Unknown Developer | Data Files | Horoscope Data | Winhoro | Unknown Developer |
| .HPP | Microsoft Corporation | Data Files | C++ Header File | Microsoft Notepad | Microsoft Corporation |
| .HPRJ | proDAD GmbH | Data Files | ProDAD Heroglyph Project | proDAD Heroglyph | proDAD GmbH |
| .HPRT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HQZ | Microsoft Corporation | Data Files | Internet Explorer For Mac File | Internet Explorer | Microsoft Corporation |
| .HRD | MSC Software | Data Files | MSC Patran Device-dependent Hardcopy Output File | Patran | MSC Software |
| .HRF | Hitachi Industrial Equipment Systems | Data Files | Hitachi Raster Format File | Intergraph SmartPlant Markup | Hexagon PPM |
| .HRM | Polar | Data Files | Polar ProTrainer Pulse Rate Save | Polar ProTrainer | Polar |
| .HRP | Jerry Blinn | Data Files | AviSys Bird Watcher Database | AviSys | Jerry Blinn |
| .HS3 | ResearchWare Inc. | Data Files | HyperRESEARCH Study Data | HyperRESEARCH | ResearchWare Inc. |
| .HSA | Microsoft Corporation | Data Files | Hagaki Studio Address Book File | Microsoft Hagaki Studio | Microsoft Corporation |
| .HSD | Microsoft Corporation | Data Files | Hagaki Studio Document File | Microsoft Hagaki Studio | Microsoft Corporation |
| .HSHADER | Microsoft Corporation | Data Files | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Microsoft Notepad | Microsoft Corporation |
| .HSN | SmatySoft Studio | Data Files | HostScan Hosts Data | HostScan | SmatySoft Studio |
| .HSP | HeliumScraper.com | Data Files | Helium Scraper Project File | Helium Scraper | HeliumScraper.com |
| .HSR | HS-Soft | Data Files | RezeptAssist Exported Data | RezeptAssist | HS-Soft |
| .HST | Yahoo! | Data Files | History File | Netscape Navigator | NetScape |
| .HSX | HBXL Building Software | Data Files | Health & Safety Xpert Project File | Health & Safety Xpert | HBXL Building Software |
| .HTB | Open Source | Data Files | Audacity Help File | Audacity | Open Source |
| .HTI | Microsoft Corporation | Data Files | Microsoft Windows WinHelp Related Data | Microsoft WinHelp | Microsoft Corporation |
| .HTN | Corel | Data Files | Micrografx Picture Publisher File | Micrografx Picture Publisher | Corel |
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