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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .I32 | National Instruments | Data Files | NI LabView Data | LabVIEW | National Instruments |
| .I3C | IBM | Data Files | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .I3F | Interactive Intelligence | Data Files | I3 Fax File | Interaction Fax | Interactive Intelligence |
| .IA6 | Tdata | Data Files | IApproach Data File | IApproach | Tdata |
| .IAD | Symantec Corporation | Data Files | Symantec Patch Management Data | Symantec Patch Management | Symantec Corporation |
| .IAR | Krzysztof Wojtas | Data Files | CD Katalog Data | CD Katalog | Krzysztof Wojtas |
| .IAS | SoftWinter | Data Files | BitDefender Data File | BitDefender | Bitdefender |
| .IAT | SafetyCulture | Data Files | iAuditor Template | iAuditor | SafetyCulture |
| .IBA | Lectra | Data Files | Lectra Clothing Design Pieces File | PAD Pattern | PAD System International Limited |
| .IBG | Lightning UK! | Data Files | ImgBurn Graph File | DVDINFOPro | Nic and Jonathan Wilson |
| .IBL | Open Source | Data Files | sIBL System Data | sIBL-Edit | Open Source |
| .IBS | IBM | Data Files | I2 iBase Data File | i2 iBase | IBM |
| .IBT | Eidos Interactive | Data Files | Texture And Model File | Deadly Shadows | Eidos Interactive |
| .IBW | WaveMetrics | Data Files | IGOR Pro Binary Wave Data | IGOR Pro | WaveMetrics |
| .IBX | Interscope s.r.l. | Data Files | Interscope BlackBox Data | Interscope BlackBox | Interscope s.r.l. |
| .ICD | Macrovision Corporation | Data Files | SafeDisc Encrypted Program | SafeDisc | Macrovision Corporation |
| .ICG | Bolide Software | Data Files | Image Comparer Gallery File | Bolide Image Comparer | Bolide Software |
| .ICMS | RagTime.de Development | Data Files | RagTime Extensions File | RagTime | RagTime.de Development |
| .ICQ | Mail.Ru | Data Files | ICQ Archive | ICQ | Mail.Ru |
| .ICR | Bolide Software | Data Files | Image Comparer Result File | Bolide Image Comparer | Bolide Software |
| .ICS | IronCAD, LLC | Data Files | IronCAD 3D CAD Drawing File | IronCAD | IronCAD, LLC |
| .ICX | Microsoft Corporation | Data Files | Remote Call Profiler Summary View | Microsoft Windows | Microsoft Corporation |
| .IDA | Microsoft Corporation | Data Files | Microsoft IIS Server Data | Microsoft IIS | Microsoft Corporation |
| .IDC | Pierre-Emmanuel Gougelet | Data Files | Core Software Tech IDC File | XnView MP | XnSoft |
| .IDEMO | NetPlay Software | Data Files | InstantDemo Project File | InstantDemo | NetPlay Software |
| .IDI | Hewlett-Packard | Data Files | EVA Controller Event Log | Enterprise Virtual Array | Hewlett-Packard |
| .IDK | Anville Instruments | Data Files | Interface Development Kit Data | Unknown Software | Unknown Developer |
| .IDM | Ulead Systems | Data Files | Ulead Photo Express Messages File | Ulead Photo Express | Ulead Systems |
| .IDQ | Microsoft Corporation | Data Files | Microsoft Internet Explorer Data Query File | Internet Explorer | Microsoft Corporation |
| .IDU | BroadVision | Data Files | Interleaf Desktop Utility Data | Interleaf Desktop Utility | BroadVision |
| .IDY | Micro Focus International plc | Data Files | Micro Focus Studio Enterprise Edition File | Studio Enterprise Edition | Micro Focus International plc |
| .IE | Genuitec | Data Files | MyEclipse Image | MyEclipse | Genuitec |
| .IED | CH2M HILL | Data Files | ISIS Event Data File | ISIS | CH2M HILL |
| .IEE-695 | Hewlett-Packard | Data Files | IEEE 695 Information PostScript File | Unknown Software | Unknown Developer |
| .IEL | Wondertouch, LLC | Data Files | ParticleIllusion SE Emitter Library File | particleIllusion | Wondertouch, LLC |
| .IES | Autodesk, Inc. | Data Files | IES Photometric Data File | AutoCAD Architecture | Autodesk, Inc. |
| .IFI | inFlow Inventory Software | Data Files | InFlow Inventory File | inFlow Inventory | inFlow Inventory Software |
| .IFM | Shana Corporation | Data Files | Informed Form Data Document | Shana Informed Filler | Shana Corporation |
| .IFN | WaveMetrics | Data Files | IGOR Pro Formatted Notebook File | IGOR Pro | WaveMetrics |
| .IFS | InfoSlips | Data Files | InfoSlips Package | InfoSlips | InfoSlips |
| .IFT | Canon Inc. | Data Files | Canon Settings Data | Unknown Software | Unknown Developer |
| .IFX | IBM | Data Files | Rational XDE Data | Rational Rose | IBM |
| .IG | elego Software Solutions GmbH | Data Files | Modula-3 Generic Interface Source | Modula-3 | elego Software Solutions GmbH |
| .IGC | Open Source | Data Files | Anime List Builder Input File | Anime List Builder | Open Source |
| .IGN | Adobe Systems Incorporated | Data Files | RoboHelp Ignore List File | Adobe RoboHelp | Adobe Systems Incorporated |
| .IGNORE | Unknown Developer | Data Files | Ignored Data File | Unknown Software | Unknown Developer |
| .II | Axialis Company | Data Files | IconWorkshop Extended Information File | Axialis IconWorkshop | Axialis Company |
| .IIE | Unknown Developer | Data Files | SimIIe Emulator Data | SimIIe - SimSystem IIe | Unknown Developer |
| .IIF | Intuit, Inc. | Data Files | Intuit Interchange Format File | Microsoft Excel | Microsoft Corporation |
| .III | Insurance Information Institute, Inc. | Data Files | Know Your Stuff File | Know Your Stuff | Insurance Information Institute, Inc. |
| .IIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Microsoft Notepad | Microsoft Corporation |
| .IKLAX | Squirrels | Data Files | AirParrot Media Data | AirParrot | Squirrels |
| .IKM | Open Source | Data Files | XWE Data | XWE | Open Source |
| .IKS | Microsoft Corporation | Data Files | Microsoft InkSeine Document File | InkSeine | Microsoft Corporation |
| .IL | Microsoft Corporation | Data Files | MSIL Assembler Input File | Microsoft Visual Studio | Microsoft Corporation |
| .IL3 | Wondertouch, LLC | Data Files | ParticleIllusion 3 Emitter Library | particleIllusion | Wondertouch, LLC |
| .ILD | Open Source | Data Files | XWE Data | XWE | Open Source |
| .ILF | Open Source | Data Files | Alim File | Alim | Open Source |
| .ILG | Flexera Software | Data Files | InstallScript Log File | Unknown Software | Unknown Developer |
| .ILJ | Honest Technology | Data Files | Honestech VHS To DVD Project | honestech VHS to DVD | Honest Technology |
| .ILOGICVB | Autodesk, Inc. | Data Files | iLogic VB File | Autodesk Inventor | Autodesk, Inc. |
| .ILR | Unity Technologies | Data Files | Unity 3D License Request | Unity Technologies Unity | Unity Technologies |
| .ILV | IBM Cognos | Data Files | ILOG File | ILOG CPLEX Optimization Studio | IBM |
| .ILX | Andrew Quilley | Data Files | Interlex Vocabulary Data | Interlex | Andrew Quilley |
| .IMA | Sage | Data Files | Sage ACT! Email Message | Act! | Swiftpage, Inc. |
| .IMAGE | Apple | Data Files | Apple Disk Image | Roxio Toast 15 | Roxio |
| .IMB | Perion Network Ltd | Data Files | IncredMail Address Book And Temporary Contacts Data | IncrediMail | Perion Network Ltd |
| .IMD | Various Developers | Data Files | GIS Image Metadata File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .IMF | id Software | Data Files | Id Music File | CocoModX | Open Source |
| .IMH | Perion Network Ltd | Data Files | IncrediMail contacts Export File | IncrediMail | Perion Network Ltd |
| .IMK | Perion Network Ltd | Data Files | IncrediMail License | IncrediMail | Perion Network Ltd |
| .IMP | Lotus Software | Data Files | Improv Spreadsheet File | Lotus 1-2-3 | IBM |
| .IMR | IBM | Data Files | Impromptu Report File | IBM Cognos Impromptu | Symitar |
| .IMS | CursorArts Company | Data Files | IconForge Create Executable Library Data | IconForge | CursorArts Company |
| .IMT | Intuit, Inc. | Data Files | My Time Data File | macOS | Apple |
| .IN | Bitplane | Data Files | SmartGENERATOR Template File | smartGenerator | Bitplane |
| .IN3 | Harvard Graphics | Data Files | Harvard Graphics Input Device Driver File | Harvard Graphics ChartXL | Harvard Graphics |
| .IN4 | Phixsoft | Data Files | InfoBlaster IN4 Registry File | InfoBlaster IN4 | Phixsoft |
| .INA | Microsoft Corporation | Data Files | MS-DOS Data File | MS-DOS | Microsoft Corporation |
| .INDEX | The Eclipse Foundation | Data Files | Eclipse Help Index | Eclipse CDT | The Eclipse Foundation |
| .INI | Microsoft Corporation | Data Files | Windows Initialization File | Notepad++ | Don Ho |
| .INK | Mimio | Data Files | Mimio Ink Data File | MimioStudio | Mimio |
| .INP | Concept Software | Data Files | Urdu InPage Document | Urdu InPage | Concept Software |
| .INS | Open Source | Data Files | LaTeX Installer Script | Microsoft Notepad | Microsoft Corporation |
| .INSID | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INST | Interscape | Data Files | RMCProfile Peak Profile Data | RMCProfile | Interscape |
| .INSTALLER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INSTALLLOG | Microsoft Corporation | Data Files | Microsoft .NET Installation Log | Microsoft Visual Studio | Microsoft Corporation |
| .INSTR | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .INTEGER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INTRO | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .INV | Copyboy | Data Files | INVedit File | INVedit | Copyboy |
| .INVENTOR | Open Source | Data Files | SGI Open Inventor File | Open Inventor | Open Source |
| .IP | Stardock Corporation | Data Files | Icon Packager Theme File | Stardock Icon Packager | Stardock Corporation |
| .IPJ | Autodesk, Inc. | Data Files | Inventor Project File | Autodesk Inventor | Autodesk, Inc. |
| .IPR | Flexera Software | Data Files | InstallShield Project | InstallShield | Flexera Software |
| .IQC | International TechneGroup Incorporated | Data Files | CADIQ Comparison Analysis Result | CADIQ | International TechneGroup Incorporated |
| .IQF | IRIS | Data Files | Integra Query File | Integra | IRIS |
| .IQR | International TechneGroup Incorporated | Data Files | CADIQ View Analysis Results | CADIQ | International TechneGroup Incorporated |
| .IQS | International TechneGroup Incorporated | Data Files | CADIQ Summary File | CADIQ | International TechneGroup Incorporated |
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