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