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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .R3D | Various Developers | Video Files | REDCODE Video File | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .RCD | Symantec Corporation | Video Files | PcAnywhere Recorded Session File | pcAnywhere | Symantec Corporation |
| .RCPROJECT | Apple | Video Files | iMovie '08 Project | Apple Final Cut Pro | Apple |
| .RCX | The LEGO Group | Video Files | Lego Mindstorms Data | LEGO MINDSTORMS NXT | The LEGO Group |
| .RDB | EMC | Video Files | Retrospect Backup Set | Retrospect | Retrospect Inc. |
| .RDG | Microsoft Corporation | Video Files | Microsoft Remote Desktop Connection Manager Configuration | Microsoft Remote Desktop Connection | Microsoft Corporation |
| .REC | TOPFIELD Co., Ltd. | Video Files | Topfield PVR Recording | Squared 5 MPEG Streamclip | Open Source |
| .RM | RealNetworks | Video Files | RealMedia File | VLC Media Player | VideoLAN |
| .RMD | Thomson Reuters Corporation | Video Files | Reference Manager Data File | Reference Manager | Thomson Reuters Corporation |
| .RMP | RealNetworks | Video Files | RealPlayer Metadata Package File | Apple iTunes | Apple |
| .RMS | RealNetworks | Video Files | Secure Real Media File | RealNetworks RealTimes | RealNetworks |
| .RMVB | RealNetworks | Video Files | RealMedia Variable Bit Rate File | RealNetworks RealTimes | RealNetworks |
| .ROQ | id Software | Video Files | Id Software Game Video | Media Player Classic | Open Source |
| .RP | Axure | Video Files | Axure RP Project File | Axure RP | Axure |
| .RSX | Red Digital Cinema Camera Company | Video Files | Temporary Red Alert Camera Data | REDCINE-X | Red Digital Cinema Camera Company |
| .RTS | Heaventools Software | Video Files | Resource Tuner Console Script | Resource Tuner Console | Heaventools Software |
| .RTV | NewTek | Video Files | NewTek Uncompressed Video Data | Unknown Software | Unknown Developer |
| .RV | Astronomical Institute of the Czech Academyof Sciences | Video Files | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RVL | muvee | Video Files | Muvee Reveal X Project File | muvee Reveal X | muvee |
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