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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .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 |
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