| sct | Scitex Continuous Tone |
| scu | ColorRIX VGA Paint Image |
| scx | ColorRIX VGA Paint Image |
| sd | TIFF Screened Data |
| sd0 | Dali Raw Image |
| sd1 | Dali Raw Image |
| sd2 | Dali Raw Image |
| sdjv | Secure DjVu Document |
| sdjvu | Secure DjVu Document |
| sdp | IBM Storyboard PIC Image |
| sdpx | Kodak Cineon Format Image |
| sdw | Multi-resolution Seamless Image Database |
| sdwx | MrSID Level 8 Image |
| sep | TIFF Separator Page |
| seq | Atari Stad Compressed Bitmap |
| sev | SevenuP Image File |
| sfc | Motic Microscope Image |
| sff | Structured Fax Format Image |
| sfw | Seattle FilmWorks Image |
| sg1 | Stanford Graphics Image |
| sg3 | Atari 8-bit Standard Graphics 3 Image |
| sgd | GeneSnap Image |
| sge | Atari 8-bit Semi-Graphic Logos Editor Image |
| sgi | SGI Image |
| sgif | Sealed GIF Image |
| sgx | Amstrad CPC SymbOS Graphic Bitmap |
| SView Gfx File |
| sham | Commodore Amiga Sliced HAM Image |
| shc | Atari 8-bit SAMAR Hi-res Interlace Image |
| shp | Atari 8-bit Blazing Paddles Shape Table |
| Atari 8-bit Movie Maker Shapes Data |
| shr | Apple IIGS Bitmap Image |
| TRS-80 MagicDraw Image |
| si | AutoDesk Softimage Document |
| sid | MrSID Image |
| Multi-resolution Seamless Image Database |
| ScanIt Document |
| sig | QuickTac SIG File |
| sim | Aurora Image |
| sir | BYU-MERS SIR Image |
| Solitaire Image Recorder Image |
| six | DEC LN03+ Sixel graphics file |
| SIXEL Bitmap |
| sixel | DEC LN03+ Sixel graphics file |
| SIXEL Bitmap |
| sized | Gallery Resized Photo |
| sj1 | Sega SJ-1 DIGIO Camera Image |
| sjp | Sealed JPEG Image |
| sjpg | Sealed JPEG Image |
| sk1 | sK1 Vector Drawing |
| skb | SketchUp Document Backup |
| skf | Autodesk AutoSketch Thumbnail |
| skitch | Skitch Image |
| skm | SketchUp Material File |
| skp | Atari 8-bit Sketch-PadDles Image |
| SketchUp Document |
| sld | 3i SlideBook image |
| smc | Lotus Freelance Graphics Scene |
| smp | Xionics SMP Image |
| spc | Graphics Magician Picture Painter bitmap image |
| Spectrum 512 Compressed Image |
| spd | C64 SpritePad Image |
| spe | WinSpec CCD Capture Data |
| spiff | Still Picture Interchange File Format Bitmap |
| spng | Sealed PNG Image |
| spot | SPOT Satellite Image |
| spp | Serif PhotoPlus Picture |
| spr | Apple II SPR Image |
| RISC OS Sprite Data |
| sprite | RISC OS Sprite Data |
| sps | Spectrum 512 Smooshed Image |
| spu | Spectrum 512 Uncompressed Image |
| spx | Spectrum 512 Extended Image |
| sr | Sun Raster Image |
| sr2 | Sony RAW Image |
| sr5 | MSX2 Graph Saurus SR5 Image |
| sr7 | MSX2 Graph Saurus Bitmap |
| srf | Sony RAW Image |
| sri | MSX2 Graph Saurus SRI Image |
| srs | MSX2+ Screen 12 Bitmap Image |
