| Extension | File Description |
| .SRW | Raster Image Files |
| .SRX | Data Files |
| .SRY | Uncommon Files |
| .SRZ | Uncommon Files |
| .SR_ | Uncommon Files |
| .SS | Uncommon Files |
| .SS0 | Uncommon Files |
| .SS1 | Uncommon Files |
| .SS2 | Uncommon Files |
| .SS3 | Uncommon Files |
| .SS4 | Uncommon Files |
| .SS5 | Uncommon Files |
| .SS5BIBLE | Uncommon Files |
| .SS5BOOK | Uncommon Files |
| .SS5CMTY | Uncommon Files |
| .SS6 | Uncommon Files |
| .SS7 | Uncommon Files |
| .SS8 | Uncommon Files |
| .SS9 | Uncommon Files |
| .SSA | Text Files |
| .SSA?? | Uncommon Files |
| .SSAGE | Uncommon Files |
| .SSB | Uncommon Files |
| .SSB?? | Uncommon Files |
| .SSBOARD | Uncommon Files |
| .SSC | Developer Files |
| .SSD | Misc Files |
| .SSD01 | Uncommon Files |
| .SSD?? | Uncommon Files |
| .SSDL | Data Files |
| .SSE | Data Files |
| .SSF | GIS Files |
| .SSG | Uncommon Files |
| .SSH | Uncommon Files |
| .SSH2 | Uncommon Files |
| .SSI | Developer Files |
| .SSIF | Uncommon Files |
| .SSJ | Uncommon Files |
| .SSK | Uncommon Files |
| .SSKD | Uncommon Files |
| .SSKDL | Uncommon Files |
| .SSL | Settings Files |
| .SSM | Video Files |
| .SSM?? | Uncommon Files |
| .SSMIL | Uncommon Files |
| .SSML | Uncommon Files |
| .SSMN | Uncommon Files |
| .SSN | Uncommon Files |
| .SSO | Uncommon Files |
| .SSP | Web Files |
| .SSP?? | Uncommon Files |
| .SSQ | Uncommon Files |
| .SSQ?? | Uncommon Files |
| .SSR | Uncommon Files |
| .SSS | Settings Files |
| .SST | Game Files |
| .SST?? | Uncommon Files |
| .SSU | Uncommon Files |
| .SSV | Data Files |
| .SSV?? | Uncommon Files |
| .SSVG | Uncommon Files |
| .SSW | Misc Files |
| .SSWF | Uncommon Files |
| .SSX | Uncommon Files |
| .SSY | Uncommon Files |
| .SSZ | Uncommon Files |
| .ST | Disk Image Files |
| .ST0 | Uncommon Files |
| .ST1 | Uncommon Files |
| .ST1H | Uncommon Files |
| .ST2 | Uncommon Files |
| .ST3 | Uncommon Files |
| .ST4 | Uncommon Files |
| .ST5 | Uncommon Files |
| .ST6 | Uncommon Files |
| Extension | File Description |
| .ST7 | Uncommon Files |
| .ST8 | Uncommon Files |
| .ST9 | Uncommon Files |
| .STA | Data Files |
| .STACK | Uncommon Files |
| .STAFF | Uncommon Files |
| .STAGE | Uncommon Files |
| .STAGE1 | Uncommon Files |
| .STAGE2 | Uncommon Files |
| .STAGE3 | Uncommon Files |
| .STAGE4 | Uncommon Files |
| .STAGE5 | Uncommon Files |
| .STAGE6 | Uncommon Files |
| .STAGE7 | Uncommon Files |
| .STAP | Audio Files |
| .STAR | Uncommon Files |
| .STARPACK | Uncommon Files |
| .START | Uncommon Files |
| .STARTED | Uncommon Files |
| .STARTUP | Uncommon Files |
| .STAT | Uncommon Files |
| .STATE | Uncommon Files |
| .STATS | Uncommon Files |
| .STATUS | Uncommon Files |
| .STB | Settings Files |
| .STC | Web Files |
| .STD | Vector Image Files |
| .STDCRC | Uncommon Files |
| .STDF | Uncommon Files |
| .STDFILE | Uncommon Files |
| .STDPRODOS | Uncommon Files |
| .STE | Settings Files |
| .STEALTH | Uncommon Files |
| .STEELDRUM | Uncommon Files |
| .STEGANO | Uncommon Files |
| .STEP | 3D Image Files |
| .STEREO | Uncommon Files |
| .STF | Settings Files |
| .STG | Backup Files |
| .STH | Uncommon Files |
| .STI | Data Files |
| .STIF | Uncommon Files |
| .STITCH | Uncommon Files |
| .STJ | Uncommon Files |
| .STK | Data Files |
| .STKX | Uncommon Files |
| .STL | Web Files |
| .STM | Data Files |
| .STML | Web Files |
| .STN | Uncommon Files |
| .STO | 3D Image Files |
| .STONE | Uncommon Files |
| .STORAGE | Uncommon Files |
| .STORY | Text Files |
| .STP | Data Files |
| .STQ | Uncommon Files |
| .STQ?? | Uncommon Files |
| .STR | Video Files |
| .STRANGE | Uncommon Files |
| .STRANGELOV | Uncommon Files |
| .STRAT | Uncommon Files |
| .STRING | Uncommon Files |
| .STRINGS | Text Files |
| .STRIPES | Uncommon Files |
| .STRIPES2 | Uncommon Files |
| .STRIPES3 | Uncommon Files |
| .STRUCT | Uncommon Files |
| .STS | Uncommon Files |
| .STSP | Uncommon Files |
| .STT | GIS Files |
| .STU | Data Files |
| .STUDENT | Uncommon Files |
| .STUDIO | Uncommon Files |
| .STUFF | Uncommon Files |
| .STUPID | Uncommon Files |
