| .RAS | Remedy Entertainment | Rastrové obrazové soubory | Remedy Archive System File | Audacity | Open Source |
| .RCL | Sonic Solutions | Rastrové obrazové soubory | Easy CD And DVD Creator 6 Project File | Roxio Creator NXT Pro 5 | Roxio |
| .RG | Open Source | Rastrové obrazové soubory | Bitmap Picture File | IrfanView | Open Source |
| .RGB | Silicon Graphics, Inc. | Rastrové obrazové soubory | RGB Bitmap | GIMP | The GIMP Development Team |
| .RGBA | Silicon Graphics, Inc. | Rastrové obrazové soubory | Silicon Graphics Image File Format | Unknown Software | Unknown Developer |
| .RGF | The LEGO Group | Rastrové obrazové soubory | LEGO MINDSTORMS EV3 Robot Graphics File | LEGO MINDSTORMS EV3 | The LEGO Group |
| .RIA | Unknown Developer | Rastrové obrazové soubory | Alpharel Group IV Raster Graphics File | Unknown Software | Unknown Developer |
| .RIC | The LEGO Group | Rastrové obrazové soubory | NXT Image File | LEGO MINDSTORMS NXT | The LEGO Group |
| .RID | Bronzware Inc | Rastrové obrazové soubory | GerbMagic Graphics | GerbMagic | Bronzware Inc |
| .RIF | Corel | Rastrové obrazové soubory | Painter Raster Image | Corel Painter | Corel |
| .RIFF | Corel | Rastrové obrazové soubory | Painter Raster Image | Corel Painter | Corel |
| .RIX | RIX SoftWorks, Inc. | Rastrové obrazové soubory | ColoRIX Image File | ColoRIX | RIX SoftWorks, Inc. |
| .RL4 | Various Developers | Rastrové obrazové soubory | Bitmap Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .RLA | Wavefront Technologies | Rastrové obrazové soubory | Alias/Wavefront Image File | XnView MP | XnSoft |
| .RLE | Various Developers | Rastrové obrazové soubory | Run Length Encoded Bitmap | Canvas X | ACD Systems |
| .RLI | RealWorld Graphics | Rastrové obrazové soubory | RealWorld Graphics Layered Image | RealWorld Icon Editor | RealWorld Graphics |
| .RNL | GTX | Rastrové obrazové soubory | GTX Runlength Encoded Bitmap Graphics | GTXRaster CAD | GTX |
| .RPF | Rockstar Games | Rastrové obrazové soubory | Grand Theft Auto Data File | Grand Theft Auto IV | Rockstar Games |
| .RRI | Astronomical Institute of the Czech Academyof Sciences | Rastrové obrazové soubory | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RSB | ReliaSoft | Rastrové obrazové soubory | ReliaSoft BlockSim File | ReliaSoft BlockSim | HBM PRENSCIA INC. |
| .RSR | Smith Micro Software | Rastrové obrazové soubory | Poser Model Preview File | Smith Micro Poser | Smith Micro Software |
| .RSS | Various Developers | Rastrové obrazové soubory | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RTL | Hewlett-Packard | Rastrové obrazové soubory | Raster Transfer Language File | SwiftView | SwiftView, Inc. |
| .RVG | Autodesk, Inc. | Rastrové obrazové soubory | Revit External Group File | Revit | Autodesk, Inc. |
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