| .RIA | Unknown Developer | Rasterbilledfiler | Alpharel Group IV Raster Graphics File | Unknown Software | Unknown Developer |
| .RIC | The LEGO Group | Rasterbilledfiler | NXT Image File | LEGO MINDSTORMS NXT | The LEGO Group |
| .RID | Bronzware Inc | Rasterbilledfiler | GerbMagic Graphics | GerbMagic | Bronzware Inc |
| .RIF | Corel | Rasterbilledfiler | Painter Raster Image | Corel Painter | Corel |
| .RIFF | Corel | Rasterbilledfiler | Painter Raster Image | Corel Painter | Corel |
| .RIX | RIX SoftWorks, Inc. | Rasterbilledfiler | ColoRIX Image File | ColoRIX | RIX SoftWorks, Inc. |
| .RL4 | Various Developers | Rasterbilledfiler | Bitmap Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .RLA | Wavefront Technologies | Rasterbilledfiler | Alias/Wavefront Image File | XnView MP | XnSoft |
| .RLE | Various Developers | Rasterbilledfiler | Run Length Encoded Bitmap | Canvas X | ACD Systems |
| .RLI | RealWorld Graphics | Rasterbilledfiler | RealWorld Graphics Layered Image | RealWorld Icon Editor | RealWorld Graphics |
| .RNL | GTX | Rasterbilledfiler | GTX Runlength Encoded Bitmap Graphics | GTXRaster CAD | GTX |
| .RPF | Rockstar Games | Rasterbilledfiler | Grand Theft Auto Data File | Grand Theft Auto IV | Rockstar Games |
| .RRI | Astronomical Institute of the Czech Academyof Sciences | Rasterbilledfiler | SPEFO Stellar Spectra Analysis Data | SPEFO | Astronomical Institute of the Czech Academyof Sciences |
| .RSB | ReliaSoft | Rasterbilledfiler | ReliaSoft BlockSim File | ReliaSoft BlockSim | HBM PRENSCIA INC. |
| .RSR | Smith Micro Software | Rasterbilledfiler | Poser Model Preview File | Smith Micro Poser | Smith Micro Software |
| .RSS | Various Developers | Rasterbilledfiler | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RTL | Hewlett-Packard | Rasterbilledfiler | Raster Transfer Language File | SwiftView | SwiftView, Inc. |
| .RVG | Autodesk, Inc. | Rasterbilledfiler | Revit External Group File | Revit | Autodesk, Inc. |
| .SAI | SYSTEMAX Software Development | Rasterbilledfiler | PaintTool SAI Image | PaintTool SAI | SYSTEMAX Software Development |
| .SAI2 | SYSTEMAX Software Development | Rasterbilledfiler | Paint Tool SAI Version 2 Drawing | PaintTool SAI | SYSTEMAX Software Development |
| .SAR | Commodore International | Rasterbilledfiler | Saracen Paint Image | XnView MP | XnSoft |
| .SBP | Autodesk, Inc. | Rasterbilledfiler | Sketchbook Express iCloud Image | SketchBook | Autodesk, Inc. |
| .SCANNER | Unknown Developer | Rasterbilledfiler | Scanner Output File | Unknown Software | Unknown Developer |
| .SCG | Midori Media | Rasterbilledfiler | MyPM SCG Definition File | Midori Media myPM SCG Classic | Midori Media |
| .SCN | Microsoft Corporation | Rasterbilledfiler | Age Of Mythology Scenario File | Microsoft Age of Empires | Ensemble Studios |
| .SCP | RIX SoftWorks, Inc. | Rasterbilledfiler | ColoRIX Bitmap Graphic File | XnView MP | XnSoft |
| .SCT | Scitex | Rasterbilledfiler | Scitex Continuous Tone File | Adobe Photoshop | Adobe Systems Incorporated |
| .SCU | RIX SoftWorks, Inc. | Rasterbilledfiler | ColoRIX Bitmap Graphic File | XnView MP | XnSoft |
| .SCX | RIX SoftWorks, Inc. | Rasterbilledfiler | ColoRIX Bitmap Graphic File | XnView MP | XnSoft |
| .SDG | Golden Software LLC | Rasterbilledfiler | Strater Project File | Strater | Golden Software LLC |
| .SDR | Dell Boomi | Rasterbilledfiler | Dell Support File | Unknown Software | Unknown Developer |
| .SEP | PictView software | Rasterbilledfiler | Separated Image File | PictView | PictView software |
| .SFC | Unknown Developer | Rasterbilledfiler | Super Nintendo ROM | Snes9x | Snes9x Team |
| .SFF | Elecbyte | Rasterbilledfiler | M.U.G.E.N. Sprite File | Elecbyte M.U.G.E.N | Elecbyte |
| .SFW | Seattle Lab | Rasterbilledfiler | Seattle FilmWorks Image | Lemkesoft GraphicConverter | Lemkesoft |
| .SGD | Syngene | Rasterbilledfiler | GeneSnap Image File | GeneSnap | Syngene |
| .SGI | Silicon Graphics, Inc. | Rasterbilledfiler | Silicon Graphics Image File | Canvas X | ACD Systems |
| .SHG | Microsoft Corporation | Rasterbilledfiler | Segmented Hyper-Graphic | Microsoft WinHelp | Microsoft Corporation |
| .SID | Valve | Rasterbilledfiler | Steam Game Data Backup File | Steam | Valve |
| .SIG | Unknown Developer | Rasterbilledfiler | Signature File | Microsoft Outlook Express | Microsoft Corporation |
| .SIM | Valve | Rasterbilledfiler | Steam Game Backup Information File | Steam | Valve |
| .SIX | Digital Equipment Corporation | Rasterbilledfiler | DEC LN03+ Sixel Bitmap Image File | Unknown Software | Unknown Developer |
| .SKM | Trimble Inc. | Rasterbilledfiler | SketchUp Materials File | SketchUp | Trimble Inc. |
| .SLD | ESRI (Environmental Systems Research Institute) | Rasterbilledfiler | Styled Layer Descriptor | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .SMP | MakeMusic, Inc. | Rasterbilledfiler | SmartMusic Performance File | SmartMusic | MakeMusic, Inc. |
| .SNAP | Erik Kunze | Rasterbilledfiler | ZX Spectrum Emulator Mirage Microdrive Snapshot | XZX-Pro | Erik Kunze |
| .SOB | Apache Software Foundation | Rasterbilledfiler | OpenOffice.org Impress Bimap Styles File | Apache OpenOffice | Apache Software Foundation |
| .SPA | Yu Higuchi | Rasterbilledfiler | MikuMikuDance Sphere Mapping File | MikuMikuDance | Yu Higuchi |
| .SPC | Various Developers | Rasterbilledfiler | Software Publisher Certificate File | OpenSSL | Open Source |
| .SPE | IBM | Rasterbilledfiler | SPSS Extension | IBM SPSS | IBM |
| .SPH | National Institute of Standards and Technology (NIST) | Rasterbilledfiler | NIST SPHERE Audio File | SoX | Open Source |
| .SPIFF | Joint Photographic Experts Group | Rasterbilledfiler | Still Picture Interchange File Format | Unknown Software | Unknown Developer |
| .SPJ | IBM | Rasterbilledfiler | SPSS Production Job File | IBM SPSS | IBM |
| .SPOT | SPOT Image | Rasterbilledfiler | SPOT Satellite Image | SPOT Images | SPOT Image |
| .SPP | Serif | Rasterbilledfiler | Serif PhotoPlus Picture File | PhotoPlus | Serif |
| .SPR | Valve | Rasterbilledfiler | Half-Life Sprite File | Half-Life | Valve |
| .SPRITE | MIT Media Lab | Rasterbilledfiler | Scratch Sprite File | MIT Scratch | MIT Media Lab |
| .SPS | IBM | Rasterbilledfiler | SPSS Program File | IBM SPSS | IBM |
| .SPU | Atari Corporation | Rasterbilledfiler | Spectrum 512 Image | Lemkesoft GraphicConverter | Lemkesoft |
| .SR | Sun Microsystems | Rasterbilledfiler | Sun Raster Image File | GIMP | The GIMP Development Team |
| .SRS | Microsoft Corporation | Rasterbilledfiler | Outlook Send/Receive Settings File | Microsoft Outlook | Microsoft Corporation |
| .SSI | Adobe Systems Incorporated | Rasterbilledfiler | Adobe Dreamweaver Server Side Include File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .STG | Microsoft Corporation | Rasterbilledfiler | ActiveSync Backup File | Microsoft ActiveSync | Microsoft Corporation |
| .SUL | Unknown Developer | Rasterbilledfiler | GFA Raytrace Image | GFA Raytrace | Unknown Developer |
| .SUN | Sun Microsystems | Rasterbilledfiler | Sun Raster Graphic File | GIMP | The GIMP Development Team |
| .SUNIFF | Sun Microsystems | Rasterbilledfiler | Sun TAAC Image | XnView MP | XnSoft |
| .SUP | Unknown Developer | Rasterbilledfiler | Subtitle Bitmap File | IfoEdit | Open Source |
| .SVA | Viz Media | Rasterbilledfiler | Manga Browser Comic File | Sharp Manga Browser for SHONEN JUMP | Viz Media |
| .SVM | Star Division | Rasterbilledfiler | StarView Metafile | Apache OpenOffice | Apache Software Foundation |
| .SVS | Nintendo | Rasterbilledfiler | Game Boy Advance Saved State File | Game Boy Advance | Nintendo |
| .T1 | XnSoft | Rasterbilledfiler | Male MRI Image Format | XnView MP | XnSoft |
| .TAAC | Sun Microsystems | Rasterbilledfiler | Sun TAAC Image | XnView MP | XnSoft |
| .TBN | Open Source | Rasterbilledfiler | Kodi Thumbnail Image | Kodi | Open Source |
| .TDP | Serif | Rasterbilledfiler | Sherif DrawPlus Thumbnail File | Serif WebPlus | Serif |
| .TEX | Open Source | Rasterbilledfiler | LaTeX Source Document | gVim | Open Source |
| .TG4 | Bentley Systems | Rasterbilledfiler | Tiled Group 4 Raster Image File | MicroStation | Bentley Systems |
| .TGA | Avid Technology | Rasterbilledfiler | Targa Graphic | Adobe Illustrator CC | Adobe Systems Incorporated |
| .THM | Sony | Rasterbilledfiler | Sony Ericsson Mobile Phone Theme File | Sony Ericsson Theme Creator | Sony Mobile Communications |
| .THUMB | Jalbum AB | Rasterbilledfiler | JAlbum Thumbnail File | JAlbum | Jalbum AB |
| .TIF | XnSoft | Rasterbilledfiler | Tagged Image File Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .TIFF | XnSoft | Rasterbilledfiler | Tagged Image File Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .TILE | XnSoft | Rasterbilledfiler | Eclipse Image | Unknown Software | Unknown Developer |
| .TIM | Sierra Entertainment | Rasterbilledfiler | The Incredible Machine Level | The Incredible Machine | Sierra Entertainment |
| .TN1 | Atari Corporation | Rasterbilledfiler | Tiny Low Resolution Image | Graphics Converter Pro | Newera Software Technology, Inc. |
| .TN2 | Atari Corporation | Rasterbilledfiler | Tiny Medium Resolution Image | XnView MP | XnSoft |
| .TN3 | Atari Corporation | Rasterbilledfiler | Tiny High Resolution Image | XnView MP | XnSoft |
| .TNY | Atari Corporation | Rasterbilledfiler | Atari Tiny Image | Graphics Converter Pro | Newera Software Technology, Inc. |
| .TPF | IBM | Rasterbilledfiler | SPSS Text Wizard Document | IBM SPSS | IBM |
| .TPI | Thomson Reuters Corporation | Rasterbilledfiler | EDIUS Plugin File | Thomson EDIUS | Grass Valley |
| .TPS | TiePie engineering | Rasterbilledfiler | Multi Channel Measurement File | Multi Channel | TiePie engineering |
| .TRIF | Tiling Task Group (TTG) | Rasterbilledfiler | Tiled Raster Interchange Format | Unknown Software | Unknown Developer |
| .TRP | VSO Software | Rasterbilledfiler | MPEG-2 HD Video Transport Stream | CyberLink PowerDVD | CyberLink |
| .TUB | Corel | Rasterbilledfiler | PaintShop Pro Picture Tube | GIMP | The GIMP Development Team |
| .U | Epic Games | Rasterbilledfiler | Unreal Tournament Class Package | Dragon UnPACKer | Open Source |
| .UFO | Ulead Systems | Rasterbilledfiler | Ulead File Object | Ulead Photo Express | Ulead Systems |
| .ULG | Pierre-Emmanuel Gougelet | Rasterbilledfiler | ULG Bitmap Image | XnView MP | XnSoft |
| .UPF | Bentley Systems | Rasterbilledfiler | MicroStation User Preferences File | MicroStation | Bentley Systems |
| .UPX | Open Source | Rasterbilledfiler | Ultimate Packer For eXecutables File | PeaZip | Open Source |
| .URT | Pierre-Emmanuel Gougelet | Rasterbilledfiler | Utah Raster Toolkit File | XnView MP | XnSoft |
| .V | Microsoft Corporation | Rasterbilledfiler | Subsampled Raw YUV Image | Microsoft Windows Media Player | Microsoft Corporation |
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