| .ILG | Flexera Software | Gegevensbestanden | InstallScript Log File | Unknown Software | Unknown Developer |
| .ILJ | Honest Technology | Gegevensbestanden | Honestech VHS To DVD Project | honestech VHS to DVD | Honest Technology |
| .ILOGICVB | Autodesk, Inc. | Gegevensbestanden | iLogic VB File | Autodesk Inventor | Autodesk, Inc. |
| .ILR | Unity Technologies | Gegevensbestanden | Unity 3D License Request | Unity Technologies Unity | Unity Technologies |
| .ILV | IBM Cognos | Gegevensbestanden | ILOG File | ILOG CPLEX Optimization Studio | IBM |
| .ILX | Andrew Quilley | Gegevensbestanden | Interlex Vocabulary Data | Interlex | Andrew Quilley |
| .IMA | Sage | Gegevensbestanden | Sage ACT! Email Message | Act! | Swiftpage, Inc. |
| .IMAGE | Apple | Gegevensbestanden | Apple Disk Image | Roxio Toast 15 | Roxio |
| .IMB | Perion Network Ltd | Gegevensbestanden | IncredMail Address Book And Temporary Contacts Data | IncrediMail | Perion Network Ltd |
| .IMD | Various Developers | Gegevensbestanden | GIS Image Metadata File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .IMF | id Software | Gegevensbestanden | Id Music File | CocoModX | Open Source |
| .IMH | Perion Network Ltd | Gegevensbestanden | IncrediMail contacts Export File | IncrediMail | Perion Network Ltd |
| .IMK | Perion Network Ltd | Gegevensbestanden | IncrediMail License | IncrediMail | Perion Network Ltd |
| .IMP | Lotus Software | Gegevensbestanden | Improv Spreadsheet File | Lotus 1-2-3 | IBM |
| .IMR | IBM | Gegevensbestanden | Impromptu Report File | IBM Cognos Impromptu | Symitar |
| .IMS | CursorArts Company | Gegevensbestanden | IconForge Create Executable Library Data | IconForge | CursorArts Company |
| .IMT | Intuit, Inc. | Gegevensbestanden | My Time Data File | macOS | Apple |
| .IN | Bitplane | Gegevensbestanden | SmartGENERATOR Template File | smartGenerator | Bitplane |
| .IN3 | Harvard Graphics | Gegevensbestanden | Harvard Graphics Input Device Driver File | Harvard Graphics ChartXL | Harvard Graphics |
| .IN4 | Phixsoft | Gegevensbestanden | InfoBlaster IN4 Registry File | InfoBlaster IN4 | Phixsoft |
| .INA | Microsoft Corporation | Gegevensbestanden | MS-DOS Data File | MS-DOS | Microsoft Corporation |
| .INDEX | The Eclipse Foundation | Gegevensbestanden | Eclipse Help Index | Eclipse CDT | The Eclipse Foundation |
| .INI | Microsoft Corporation | Gegevensbestanden | Windows Initialization File | Notepad++ | Don Ho |
| .INK | Mimio | Gegevensbestanden | Mimio Ink Data File | MimioStudio | Mimio |
| .INP | Concept Software | Gegevensbestanden | Urdu InPage Document | Urdu InPage | Concept Software |
| .INS | Open Source | Gegevensbestanden | LaTeX Installer Script | Microsoft Notepad | Microsoft Corporation |
| .INSID | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INST | Interscape | Gegevensbestanden | RMCProfile Peak Profile Data | RMCProfile | Interscape |
| .INSTALLER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INSTALLLOG | Microsoft Corporation | Gegevensbestanden | Microsoft .NET Installation Log | Microsoft Visual Studio | Microsoft Corporation |
| .INSTR | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .INTEGER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INTRO | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .INV | Copyboy | Gegevensbestanden | INVedit File | INVedit | Copyboy |
| .INVENTOR | Open Source | Gegevensbestanden | SGI Open Inventor File | Open Inventor | Open Source |
| .IP | Stardock Corporation | Gegevensbestanden | Icon Packager Theme File | Stardock Icon Packager | Stardock Corporation |
| .IPJ | Autodesk, Inc. | Gegevensbestanden | Inventor Project File | Autodesk Inventor | Autodesk, Inc. |
| .IPR | Flexera Software | Gegevensbestanden | InstallShield Project | InstallShield | Flexera Software |
| .IQC | International TechneGroup Incorporated | Gegevensbestanden | CADIQ Comparison Analysis Result | CADIQ | International TechneGroup Incorporated |
| .IQF | IRIS | Gegevensbestanden | Integra Query File | Integra | IRIS |
| .IQR | International TechneGroup Incorporated | Gegevensbestanden | CADIQ View Analysis Results | CADIQ | International TechneGroup Incorporated |
| .IQS | International TechneGroup Incorporated | Gegevensbestanden | CADIQ Summary File | CADIQ | International TechneGroup Incorporated |
| .IR | Crestron Electronics | Gegevensbestanden | DEAL For Windows File | DEAL | Crestron Electronics |
| .IRI | GRAYESS | Gegevensbestanden | Infrared Image | IRT Cronista | GRAYESS |
| .IROCK | Engius | Gegevensbestanden | IntelliRock Sensor Data File | Engius rockWare | Engius |
| .IRP | Zylox Software, Inc. | Gegevensbestanden | Internet Researcher Project File | Internet Researcher | Zylox Software, Inc. |
| .IRX | Martin Stanek | Gegevensbestanden | Brewer Irradiation File | UVBrewer | Interscape |
| .IS2 | GRAYESS | Gegevensbestanden | Thermal Image Data File | IRT Cronista | GRAYESS |
| .ISC | Xilinx, Inc. | Gegevensbestanden | Xilinx Device Configuration File | Xilinx Platform Studio (XPS) | Xilinx, Inc. |
| .ISD | Flexera Software | Gegevensbestanden | Flexera InstallShield Dialog Box File | InstallShield | Flexera Software |
| .ISF | Inspiration Software Inc. | Gegevensbestanden | Inspiration Flowchart Document | Inspiration Software | Inspiration Software Inc. |
| .IST | Flexera Software | Gegevensbestanden | InstallShield Project Template File | InstallShield | Flexera Software |
| .ISV | Harris Geospatial Solutions | Gegevensbestanden | IDL iTools State | IDL | Harris Geospatial Solutions |
| .IT3 | Unknown Developer | Gegevensbestanden | Internet Timer 3 Log | Unknown Software | Unknown Developer |
| .ITD | SDL Trados | Gegevensbestanden | SDL Trados Translation File | SDL Trados | SDL Trados |
| .ITE | Apple | Gegevensbestanden | iTunes Extras File | Apple iTunes | Apple |
| .ITF | Interactive Data Corporation | Gegevensbestanden | eSignal Integrated Trading Data | eSignal | Interactive Data Corporation |
| .ITL | Apple | Gegevensbestanden | iTunes Library File | Apple iTunes | Apple |
| .ITM | isee systems | Gegevensbestanden | iThink Model File | iThink Architect | isee systems |
| .ITN | TomTom International BV | Gegevensbestanden | TomTom Navigator Itinerary File | TomTom HOME | TomTom NV |
| .ITP | BioWare | Gegevensbestanden | Bioware Palette Data | BioWare Neverwinter Nights | BioWare |
| .ITRACE | Microsoft Corporation | Gegevensbestanden | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .ITU | Unknown Developer | Gegevensbestanden | Shefield Dictionary | Unknown Software | Unknown Developer |
| .ITW | Prairie Group | Gegevensbestanden | InTouch With Database File | Prairie Group InTouch With | Prairie Group |
| .ITX | IBM | Gegevensbestanden | ITX Form Template | FileNet eForms | IBM |
| .IUT | Open Source | Gegevensbestanden | SPaCIoS Tool IUT Definition | SPaCIoS Tool | Open Source |
| .IVC | InteliSea | Gegevensbestanden | InteliSea Vessel Configuration File | InteliSea Configuration Manager | InteliSea |
| .IVD | Bitdefender | Gegevensbestanden | Incremental Virus Definitions File | Bitdefender Total Security 2018 | Bitdefender |
| .IVI | Microsoft Corporation | Gegevensbestanden | MSDN InfoViewer Topic Data | Microsoft Visual Studio | Microsoft Corporation |
| .IVN | Microsoft Corporation | Gegevensbestanden | iView MediaPro Catalogue File | iView Media Pro | iView Multimedia |
| .IVP | Oracle Corporation | Gegevensbestanden | Panorama File | Java | Oracle Corporation |
| .IVS | Thomas d'Otreppe de Bouvette | Gegevensbestanden | Initialization Vector File | Aircrack-ng | Thomas d'Otreppe de Bouvette |
| .IVT | AddGames Italia | Gegevensbestanden | International Volleyball 2006 Data File | International Volleyball 2006 | AddGames Italia |
| .IW | IWIS | Gegevensbestanden | Chain Engineering Database File | Chain Engineering | IWIS |
| .IWL | Incomedia | Gegevensbestanden | WebSite X5 License File | Website X5 | Incomedia |
| .IWM | iWriteMusicProject | Gegevensbestanden | iWriteMusic Song Exchange Format | iWriteMusic | iWriteMusicProject |
| .IX | Corel | Gegevensbestanden | Corel WordPerfect Office Template File | Corel WordPerfect | Corel |
| .IXB | Corel | Gegevensbestanden | Ulead Disc Image | DVD MovieFactory | Corel |
| .IXC | ESRI (Environmental Systems Research Institute) | Gegevensbestanden | ArcView Geocoding Index For Read-Write Coverages File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .IXE | Unknown Developer | Gegevensbestanden | InterEX Control File | Unknown Software | Unknown Developer |
| .IXF | IBM | Gegevensbestanden | Integration Exchange Format File | IBM DB2 | IBM |
| .IXR | System Simulation | Gegevensbestanden | Index+ For Windows Report Definition File | Index+ | System Simulation |
| .IZD | United Planet | Gegevensbestanden | Intrexx Application Export Format | Intrexx | United Planet |
| .J1 | Unknown Developer | Gegevensbestanden | EDIT Compiler JEDEC Boundary File | Unknown Software | Unknown Developer |
| .JASPER | Jaspersoft | Gegevensbestanden | JasperReports Data File | JasperReports | Jaspersoft |
| .JAW | JustSystems | Gegevensbestanden | Ichitaro File | Ichitaro | JustSystems |
| .JBB | Damian Brunold | Gegevensbestanden | Jbead Data | Jbead | Damian Brunold |
| .JBD | Symantec Corporation | Gegevensbestanden | Norton Antivirus Definiton Update File Format | Norton Security | Symantec Corporation |
| .JBI | Yaskawa Motoman | Gegevensbestanden | Motoman Robot Job File | MotoPallet EG | Yaskawa Motoman |
| .JBW | Scitor | Gegevensbestanden | Scitor Project Scheduler Schedule Data | Project Scheduler | Scitor |
| .JBX | Unknown Developer | Gegevensbestanden | Project Scheduler Data | Unknown Software | Unknown Developer |
| .JCAMP | Joint Committee on Atomic and Molecular Physical Data (JCAMP-DX ) | Gegevensbestanden | JCAMP Standard NMR Data Format | Unknown Software | Unknown Developer |
| .JCC | Open Source | Gegevensbestanden | Code Crusader Project Data | Code Crusader | Open Source |
| .JCD | Hou Yantang | Gegevensbestanden | FlashGet Saved Data | FlashGet | Hou Yantang |
| .JCE | Glenn Rosenthal | Gegevensbestanden | JWPce File | JWPce | Glenn Rosenthal |
| .JCK | Microsoft Corporation | Gegevensbestanden | Microsoft Liquid Motion JACK Scene Escription | Liquid Motion | Microsoft Corporation |
| .JCV | JC Video | Gegevensbestanden | JC Video Systems Data | Unknown Software | Unknown Developer |
| .JD | Orchid Technology KK | Gegevensbestanden | Jigsaw Terminal File | Jigsaw Platform | Orchid Technology KK |
| .JDB | Symantec Corporation | Gegevensbestanden | Symantec Endpoint Protection Update File | Symantec EndPoint Protection 12 | Symantec Corporation |
| .JDBG | Open Source | Gegevensbestanden | Embedded JCL Debug Information | Project JEDI | Open Source |
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