| .HRM | Polar | Gegevensbestanden | Polar ProTrainer Pulse Rate Save | Polar ProTrainer | Polar |
| .HRP | Jerry Blinn | Gegevensbestanden | AviSys Bird Watcher Database | AviSys | Jerry Blinn |
| .HS3 | ResearchWare Inc. | Gegevensbestanden | HyperRESEARCH Study Data | HyperRESEARCH | ResearchWare Inc. |
| .HSA | Microsoft Corporation | Gegevensbestanden | Hagaki Studio Address Book File | Microsoft Hagaki Studio | Microsoft Corporation |
| .HSD | Microsoft Corporation | Gegevensbestanden | Hagaki Studio Document File | Microsoft Hagaki Studio | Microsoft Corporation |
| .HSHADER | Microsoft Corporation | Gegevensbestanden | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .HSK | Huskey Truss & Building Supply | Gegevensbestanden | Huskey Truss & Building Supply Import File | Microsoft Notepad | Microsoft Corporation |
| .HSN | SmatySoft Studio | Gegevensbestanden | HostScan Hosts Data | HostScan | SmatySoft Studio |
| .HSP | HeliumScraper.com | Gegevensbestanden | Helium Scraper Project File | Helium Scraper | HeliumScraper.com |
| .HSR | HS-Soft | Gegevensbestanden | RezeptAssist Exported Data | RezeptAssist | HS-Soft |
| .HST | Yahoo! | Gegevensbestanden | History File | Netscape Navigator | NetScape |
| .HSX | HBXL Building Software | Gegevensbestanden | Health & Safety Xpert Project File | Health & Safety Xpert | HBXL Building Software |
| .HTB | Open Source | Gegevensbestanden | Audacity Help File | Audacity | Open Source |
| .HTI | Microsoft Corporation | Gegevensbestanden | Microsoft Windows WinHelp Related Data | Microsoft WinHelp | Microsoft Corporation |
| .HTN | Corel | Gegevensbestanden | Micrografx Picture Publisher File | Micrografx Picture Publisher | Corel |
| .HTW | Microsoft Corporation | Gegevensbestanden | IIS Webhits Template | Microsoft IIS | Microsoft Corporation |
| .HUE | HUE | Gegevensbestanden | HUE Animation Project | HUE Animation | HUE |
| .HUF | David A. Huffman | Gegevensbestanden | Huffman Encoded Data | Unknown Software | Unknown Developer |
| .HUH | HydroCAD Software Solutions | Gegevensbestanden | HydroCAD Unit Hydrograph Definitions File | HydroCAD | HydroCAD Software Solutions |
| .HUN | Interscape | Gegevensbestanden | Personal Paint Hungarian Language User Interface | Personal Paint | Amiga |
| .HVUF | Unknown Developer | Gegevensbestanden | Hydraulic Calculation Format | Unknown Software | Unknown Developer |
| .HW | CLO Virtual Fashion Inc. | Gegevensbestanden | Marvelous Designer Hardware ID Data | Marvelous Designer | CLO Virtual Fashion Inc. |
| .HW3 | SoftBIt | Gegevensbestanden | World Literary Heritage Document File | World Literary Heritage | SoftBIt |
| .HWF | Hantek | Gegevensbestanden | Hantek HDG2000B Wave Format Data | HDG2002B | Hantek |
| .HWL | Corel | Gegevensbestanden | Corel Writing Tools File | Corel WordPerfect X8 | Corel |
| .HWOF | Microsoft Corporation | Gegevensbestanden | Microsoft Office For Mac Help File | Microsoft Office | Microsoft Corporation |
| .HWPML | Hancom, Inc. | Gegevensbestanden | Hangul Word Processor Markup Language Document | Hangul | Hancom, Inc. |
| .HWV | Open Source | Gegevensbestanden | Hades Waveform Viewer Data | Hades simulation framework | Open Source |
| .HWX | Rockwell Automation Inc. | Gegevensbestanden | RSNetWorx Registration Data | RSNetWorx | Rockwell Automation Inc. |
| .HXD | Microsoft Corporation | Gegevensbestanden | Microsoft Help Validator Data File | Microsoft Visual Studio | Microsoft Corporation |
| .HXE | Microsoft Corporation | Gegevensbestanden | Microsoft Windows Help Samples Definition File | Microsoft Windows Help | Microsoft Corporation |
| .HXF | Microsoft Corporation | Gegevensbestanden | Microsoft Help 2 Project Include File | Microsoft Windows | Microsoft Corporation |
| .HXL | Microsoft Corporation | Gegevensbestanden | Microsoft Help Registered Namespace List File | Microsoft Windows Help | Microsoft Corporation |
| .HXQ | Microsoft Corporation | Gegevensbestanden | Microsoft Help 2 Query Index | Microsoft Visual Studio | Microsoft Corporation |
| .HXR | Microsoft Corporation | Gegevensbestanden | Microsoft Help Data File | Microsoft Visual Studio | Microsoft Corporation |
| .HXT | Microsoft Corporation | Gegevensbestanden | Microsoft Help 2 Table Of Contents File | Microsoft Windows | Microsoft Corporation |
| .HY1 | Corel | Gegevensbestanden | Ventura Publisher Hyphenation Algorithm File | Ventura Publisher | Corel |
| .HY2 | Corel | Gegevensbestanden | Ventura Publisher Hyphenation Algorithm File | Ventura Publisher | Corel |
| .HYC | Corel | Gegevensbestanden | Corel WordPerfect Hyphenation Data File | Corel WordPerfect | Corel |
| .HYD | MARIN | Gegevensbestanden | MARIN Hydrodynamic Database File | Unknown Software | Unknown Developer |
| .HYP | Interscape | Gegevensbestanden | HYPER Compressed Archive | Hyper | Interscape |
| .HZF | Home Inspection Software | Gegevensbestanden | Client Inspection File | Home Inspector Pro | Home Inspection Software |
| .I32 | National Instruments | Gegevensbestanden | NI LabView Data | LabVIEW | National Instruments |
| .I3C | IBM | Gegevensbestanden | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .I3F | Interactive Intelligence | Gegevensbestanden | I3 Fax File | Interaction Fax | Interactive Intelligence |
| .IA6 | Tdata | Gegevensbestanden | IApproach Data File | IApproach | Tdata |
| .IAD | Symantec Corporation | Gegevensbestanden | Symantec Patch Management Data | Symantec Patch Management | Symantec Corporation |
| .IAR | Krzysztof Wojtas | Gegevensbestanden | CD Katalog Data | CD Katalog | Krzysztof Wojtas |
| .IAS | SoftWinter | Gegevensbestanden | BitDefender Data File | BitDefender | Bitdefender |
| .IAT | SafetyCulture | Gegevensbestanden | iAuditor Template | iAuditor | SafetyCulture |
| .IBA | Lectra | Gegevensbestanden | Lectra Clothing Design Pieces File | PAD Pattern | PAD System International Limited |
| .IBG | Lightning UK! | Gegevensbestanden | ImgBurn Graph File | DVDINFOPro | Nic and Jonathan Wilson |
| .IBL | Open Source | Gegevensbestanden | sIBL System Data | sIBL-Edit | Open Source |
| .IBS | IBM | Gegevensbestanden | I2 iBase Data File | i2 iBase | IBM |
| .IBT | Eidos Interactive | Gegevensbestanden | Texture And Model File | Deadly Shadows | Eidos Interactive |
| .IBW | WaveMetrics | Gegevensbestanden | IGOR Pro Binary Wave Data | IGOR Pro | WaveMetrics |
| .IBX | Interscope s.r.l. | Gegevensbestanden | Interscope BlackBox Data | Interscope BlackBox | Interscope s.r.l. |
| .ICD | Macrovision Corporation | Gegevensbestanden | SafeDisc Encrypted Program | SafeDisc | Macrovision Corporation |
| .ICG | Bolide Software | Gegevensbestanden | Image Comparer Gallery File | Bolide Image Comparer | Bolide Software |
| .ICMS | RagTime.de Development | Gegevensbestanden | RagTime Extensions File | RagTime | RagTime.de Development |
| .ICQ | Mail.Ru | Gegevensbestanden | ICQ Archive | ICQ | Mail.Ru |
| .ICR | Bolide Software | Gegevensbestanden | Image Comparer Result File | Bolide Image Comparer | Bolide Software |
| .ICS | IronCAD, LLC | Gegevensbestanden | IronCAD 3D CAD Drawing File | IronCAD | IronCAD, LLC |
| .ICX | Microsoft Corporation | Gegevensbestanden | Remote Call Profiler Summary View | Microsoft Windows | Microsoft Corporation |
| .IDA | Microsoft Corporation | Gegevensbestanden | Microsoft IIS Server Data | Microsoft IIS | Microsoft Corporation |
| .IDC | Pierre-Emmanuel Gougelet | Gegevensbestanden | Core Software Tech IDC File | XnView MP | XnSoft |
| .IDEMO | NetPlay Software | Gegevensbestanden | InstantDemo Project File | InstantDemo | NetPlay Software |
| .IDI | Hewlett-Packard | Gegevensbestanden | EVA Controller Event Log | Enterprise Virtual Array | Hewlett-Packard |
| .IDK | Anville Instruments | Gegevensbestanden | Interface Development Kit Data | Unknown Software | Unknown Developer |
| .IDM | Ulead Systems | Gegevensbestanden | Ulead Photo Express Messages File | Ulead Photo Express | Ulead Systems |
| .IDQ | Microsoft Corporation | Gegevensbestanden | Microsoft Internet Explorer Data Query File | Internet Explorer | Microsoft Corporation |
| .IDU | BroadVision | Gegevensbestanden | Interleaf Desktop Utility Data | Interleaf Desktop Utility | BroadVision |
| .IDY | Micro Focus International plc | Gegevensbestanden | Micro Focus Studio Enterprise Edition File | Studio Enterprise Edition | Micro Focus International plc |
| .IE | Genuitec | Gegevensbestanden | MyEclipse Image | MyEclipse | Genuitec |
| .IED | CH2M HILL | Gegevensbestanden | ISIS Event Data File | ISIS | CH2M HILL |
| .IEE-695 | Hewlett-Packard | Gegevensbestanden | IEEE 695 Information PostScript File | Unknown Software | Unknown Developer |
| .IEL | Wondertouch, LLC | Gegevensbestanden | ParticleIllusion SE Emitter Library File | particleIllusion | Wondertouch, LLC |
| .IES | Autodesk, Inc. | Gegevensbestanden | IES Photometric Data File | AutoCAD Architecture | Autodesk, Inc. |
| .IFI | inFlow Inventory Software | Gegevensbestanden | InFlow Inventory File | inFlow Inventory | inFlow Inventory Software |
| .IFM | Shana Corporation | Gegevensbestanden | Informed Form Data Document | Shana Informed Filler | Shana Corporation |
| .IFN | WaveMetrics | Gegevensbestanden | IGOR Pro Formatted Notebook File | IGOR Pro | WaveMetrics |
| .IFS | InfoSlips | Gegevensbestanden | InfoSlips Package | InfoSlips | InfoSlips |
| .IFT | Canon Inc. | Gegevensbestanden | Canon Settings Data | Unknown Software | Unknown Developer |
| .IFX | IBM | Gegevensbestanden | Rational XDE Data | Rational Rose | IBM |
| .IG | elego Software Solutions GmbH | Gegevensbestanden | Modula-3 Generic Interface Source | Modula-3 | elego Software Solutions GmbH |
| .IGC | Open Source | Gegevensbestanden | Anime List Builder Input File | Anime List Builder | Open Source |
| .IGN | Adobe Systems Incorporated | Gegevensbestanden | RoboHelp Ignore List File | Adobe RoboHelp | Adobe Systems Incorporated |
| .IGNORE | Unknown Developer | Gegevensbestanden | Ignored Data File | Unknown Software | Unknown Developer |
| .II | Axialis Company | Gegevensbestanden | IconWorkshop Extended Information File | Axialis IconWorkshop | Axialis Company |
| .IIE | Unknown Developer | Gegevensbestanden | SimIIe Emulator Data | SimIIe - SimSystem IIe | Unknown Developer |
| .IIF | Intuit, Inc. | Gegevensbestanden | Intuit Interchange Format File | Microsoft Excel | Microsoft Corporation |
| .III | Insurance Information Institute, Inc. | Gegevensbestanden | Know Your Stuff File | Know Your Stuff | Insurance Information Institute, Inc. |
| .IIL | Symantec Corporation | Gegevensbestanden | Norton CleanSweep Installation Log File | Microsoft Notepad | Microsoft Corporation |
| .IKLAX | Squirrels | Gegevensbestanden | AirParrot Media Data | AirParrot | Squirrels |
| .IKM | Open Source | Gegevensbestanden | XWE Data | XWE | Open Source |
| .IKS | Microsoft Corporation | Gegevensbestanden | Microsoft InkSeine Document File | InkSeine | Microsoft Corporation |
| .IL | Microsoft Corporation | Gegevensbestanden | MSIL Assembler Input File | Microsoft Visual Studio | Microsoft Corporation |
| .IL3 | Wondertouch, LLC | Gegevensbestanden | ParticleIllusion 3 Emitter Library | particleIllusion | Wondertouch, LLC |
| .ILD | Open Source | Gegevensbestanden | XWE Data | XWE | Open Source |
| .ILF | Open Source | Gegevensbestanden | Alim File | Alim | Open Source |
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