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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .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 |
| .IR | Crestron Electronics | Data Files | DEAL For Windows File | DEAL | Crestron Electronics |
| .IRI | GRAYESS | Data Files | Infrared Image | IRT Cronista | GRAYESS |
| .IROCK | Engius | Data Files | IntelliRock Sensor Data File | Engius rockWare | Engius |
| .IRP | Zylox Software, Inc. | Data Files | Internet Researcher Project File | Internet Researcher | Zylox Software, Inc. |
| .IRX | Martin Stanek | Data Files | Brewer Irradiation File | UVBrewer | Interscape |
| .IS2 | GRAYESS | Data Files | Thermal Image Data File | IRT Cronista | GRAYESS |
| .ISC | Xilinx, Inc. | Data Files | Xilinx Device Configuration File | Xilinx Platform Studio (XPS) | Xilinx, Inc. |
| .ISD | Flexera Software | Data Files | Flexera InstallShield Dialog Box File | InstallShield | Flexera Software |
| .ISF | Inspiration Software Inc. | Data Files | Inspiration Flowchart Document | Inspiration Software | Inspiration Software Inc. |
| .IST | Flexera Software | Data Files | InstallShield Project Template File | InstallShield | Flexera Software |
| .ISV | Harris Geospatial Solutions | Data Files | IDL iTools State | IDL | Harris Geospatial Solutions |
| .IT3 | Unknown Developer | Data Files | Internet Timer 3 Log | Unknown Software | Unknown Developer |
| .ITD | SDL Trados | Data Files | SDL Trados Translation File | SDL Trados | SDL Trados |
| .ITE | Apple | Data Files | iTunes Extras File | Apple iTunes | Apple |
| .ITF | Interactive Data Corporation | Data Files | eSignal Integrated Trading Data | eSignal | Interactive Data Corporation |
| .ITL | Apple | Data Files | iTunes Library File | Apple iTunes | Apple |
| .ITM | isee systems | Data Files | iThink Model File | iThink Architect | isee systems |
| .ITN | TomTom International BV | Data Files | TomTom Navigator Itinerary File | TomTom HOME | TomTom NV |
| .ITP | BioWare | Data Files | Bioware Palette Data | BioWare Neverwinter Nights | BioWare |
| .ITRACE | Microsoft Corporation | Data Files | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .ITU | Unknown Developer | Data Files | Shefield Dictionary | Unknown Software | Unknown Developer |
| .ITW | Prairie Group | Data Files | InTouch With Database File | Prairie Group InTouch With | Prairie Group |
| .ITX | IBM | Data Files | ITX Form Template | FileNet eForms | IBM |
| .IUT | Open Source | Data Files | SPaCIoS Tool IUT Definition | SPaCIoS Tool | Open Source |
| .IVC | InteliSea | Data Files | InteliSea Vessel Configuration File | InteliSea Configuration Manager | InteliSea |
| .IVD | Bitdefender | Data Files | Incremental Virus Definitions File | Bitdefender Total Security 2018 | Bitdefender |
| .IVI | Microsoft Corporation | Data Files | MSDN InfoViewer Topic Data | Microsoft Visual Studio | Microsoft Corporation |
| .IVN | Microsoft Corporation | Data Files | iView MediaPro Catalogue File | iView Media Pro | iView Multimedia |
| .IVP | Oracle Corporation | Data Files | Panorama File | Java | Oracle Corporation |
| .IVS | Thomas d'Otreppe de Bouvette | Data Files | Initialization Vector File | Aircrack-ng | Thomas d'Otreppe de Bouvette |
| .IVT | AddGames Italia | Data Files | International Volleyball 2006 Data File | International Volleyball 2006 | AddGames Italia |
| .IW | IWIS | Data Files | Chain Engineering Database File | Chain Engineering | IWIS |
| .IWL | Incomedia | Data Files | WebSite X5 License File | Website X5 | Incomedia |
| .IWM | iWriteMusicProject | Data Files | iWriteMusic Song Exchange Format | iWriteMusic | iWriteMusicProject |
| .IX | Corel | Data Files | Corel WordPerfect Office Template File | Corel WordPerfect | Corel |
| .IXB | Corel | Data Files | Ulead Disc Image | DVD MovieFactory | Corel |
| .IXC | ESRI (Environmental Systems Research Institute) | Data Files | ArcView Geocoding Index For Read-Write Coverages File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .IXE | Unknown Developer | Data Files | InterEX Control File | Unknown Software | Unknown Developer |
| .IXF | IBM | Data Files | Integration Exchange Format File | IBM DB2 | IBM |
| .IXR | System Simulation | Data Files | Index+ For Windows Report Definition File | Index+ | System Simulation |
| .IZD | United Planet | Data Files | Intrexx Application Export Format | Intrexx | United Planet |
| .J1 | Unknown Developer | Data Files | EDIT Compiler JEDEC Boundary File | Unknown Software | Unknown Developer |
| .JASPER | Jaspersoft | Data Files | JasperReports Data File | JasperReports | Jaspersoft |
| .JAW | JustSystems | Data Files | Ichitaro File | Ichitaro | JustSystems |
| .JBB | Damian Brunold | Data Files | Jbead Data | Jbead | Damian Brunold |
| .JBD | Symantec Corporation | Data Files | Norton Antivirus Definiton Update File Format | Norton Security | Symantec Corporation |
| .JBI | Yaskawa Motoman | Data Files | Motoman Robot Job File | MotoPallet EG | Yaskawa Motoman |
| .JBW | Scitor | Data Files | Scitor Project Scheduler Schedule Data | Project Scheduler | Scitor |
| .JBX | Unknown Developer | Data Files | Project Scheduler Data | Unknown Software | Unknown Developer |
| .JCAMP | Joint Committee on Atomic and Molecular Physical Data (JCAMP-DX ) | Data Files | JCAMP Standard NMR Data Format | Unknown Software | Unknown Developer |
| .JCC | Open Source | Data Files | Code Crusader Project Data | Code Crusader | Open Source |
| .JCD | Hou Yantang | Data Files | FlashGet Saved Data | FlashGet | Hou Yantang |
| .JCE | Glenn Rosenthal | Data Files | JWPce File | JWPce | Glenn Rosenthal |
| .JCK | Microsoft Corporation | Data Files | Microsoft Liquid Motion JACK Scene Escription | Liquid Motion | Microsoft Corporation |
| .JCV | JC Video | Data Files | JC Video Systems Data | Unknown Software | Unknown Developer |
| .JD | Orchid Technology KK | Data Files | Jigsaw Terminal File | Jigsaw Platform | Orchid Technology KK |
| .JDB | Symantec Corporation | Data Files | Symantec Endpoint Protection Update File | Symantec EndPoint Protection 12 | Symantec Corporation |
| .JDBG | Open Source | Data Files | Embedded JCL Debug Information | Project JEDI | Open Source |
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