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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .IFO | Various Developers | Video Files | DVD-Video Disc Information File | CyberLink PowerDVD | CyberLink |
| .IFV | Intel Corporation | Video Files | Indeo Video Format File | Microsoft Windows Media Player | Microsoft Corporation |
| .IMOVIEPROJ | Apple | Video Files | iMovie Project File | Roxio Toast 15 | Roxio |
| .INP | Concept Software | Video Files | Urdu InPage Document | Urdu InPage | Concept Software |
| .IPR | Flexera Software | Video Files | InstallShield Project | InstallShield | Flexera Software |
| .IRF | iView Technology | Video Files | CCTV DVR H.264 Video File | iVIEW Technology Irftool | iView Technology |
| .ISM | Microsoft Corporation | Video Files | IIS Smooth Streaming Manifest File | Microsoft IIS | Microsoft Corporation |
| .ISMV | Microsoft Corporation | Video Files | Smooth Streaming MPEG-4 Multimedia Fragment | Smooth Streaming | Microsoft Corporation |
| .IVA | Unknown Developer | Video Files | Surveillance Video File | Unknown Software | Unknown Developer |
| .IVF | Intel Corporation | Video Files | Indeo Video Format File | Microsoft Windows Media Player | Microsoft Corporation |
| .IVR | RealNetworks | Video Files | Internet Video Recording | RealNetworks RealTimes | RealNetworks |
| .IVS | Thomas d'Otreppe de Bouvette | Video Files | Initialization Vector File | Aircrack-ng | Thomas d'Otreppe de Bouvette |
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