| Extension | File Description |
| .STV | Uncommon Files |
| .STVINI | Uncommon Files |
| .STW | Text Files |
| .STX | Video Files |
| .STY | Settings Files |
| .STYKZ | Data Files |
| .STYLE | Settings Files |
| .STYXML | Uncommon Files |
| .STZ | Uncommon Files |
| .SU | Uncommon Files |
| .SU0 | Uncommon Files |
| .SU1 | Uncommon Files |
| .SU2 | Uncommon Files |
| .SU3 | Uncommon Files |
| .SU4 | Uncommon Files |
| .SU5 | Uncommon Files |
| .SU6 | Uncommon Files |
| .SU7 | Uncommon Files |
| .SU8 | Uncommon Files |
| .SU9 | Uncommon Files |
| .SUA | Uncommon Files |
| .SUB | Text Files |
| .SUBS | Uncommon Files |
| .SUBTITLE | Uncommon Files |
| .SUC | Uncommon Files |
| .SUCKS | Uncommon Files |
| .SUD | Game Files |
| .SUE | Uncommon Files |
| .SUF | Encoded Files |
| .SUG | Uncommon Files |
| .SUH | Uncommon Files |
| .SUI | Data Files |
| .SUIT | Font Files |
| .SUITE | Uncommon Files |
| .SUJ | Uncommon Files |
| .SUK | Uncommon Files |
| .SUL | Uncommon Files |
| .SUM | Misc Files |
| .SUMM | Uncommon Files |
| .SUMMARY | Uncommon Files |
| .SUMP | Uncommon Files |
| .SUMSHEET | Uncommon Files |
| .SUN | Raster Image Files |
| .SUN3 | Uncommon Files |
| .SUN4 | Uncommon Files |
| .SUN5 | Uncommon Files |
| .SUNIFF | Raster Image Files |
| .SUO | Developer Files |
| .SUP | Developer Files |
| .SUPER | Uncommon Files |
| .SUPERCAT | Uncommon Files |
| .SUPERPRINT | Uncommon Files |
| .SUPPLEMENT | Uncommon Files |
| .SUPPORT | Uncommon Files |
| .SUQ | Uncommon Files |
| .SUQ?? | Uncommon Files |
| .SUR | Uncommon Files |
| .SURF | Uncommon Files |
| .SURFPLACE | Uncommon Files |
| .SUS | Uncommon Files |
| .SUSANNAH | Uncommon Files |
| .SUSP | Data Files |
| .SUST | Uncommon Files |
| .SUT | Uncommon Files |
| .SUT?? | Uncommon Files |
| .SUU | Uncommon Files |
| .SUV | Uncommon Files |
| .SUW | Uncommon Files |
| .SUX | Uncommon Files |
| .SUY | Uncommon Files |
| .SUZ | Uncommon Files |
| .SV | Uncommon Files |
| .SV$ | Backup Files |
| .SV0 | Uncommon Files |
| .SV1 | Uncommon Files |
| Extension | File Description |
| .SV2 | Uncommon Files |
| .SV2I | Backup Files |
| .SV3 | Uncommon Files |
| .SV4 | Uncommon Files |
| .SV4CPIO | Compressed Files |
| .SV4CRC | Data Files |
| .SV5 | Game Files |
| .SV6 | Game Files |
| .SV7 | Uncommon Files |
| .SV8 | Uncommon Files |
| .SV9 | Uncommon Files |
| .SVA | Uncommon Files |
| .SVB | Uncommon Files |
| .SVC | Web Files |
| .SVD | Data Files |
| .SVE | Game Files |
| .SVF | Vector Image Files |
| .SVG | Vector Image Files |
| .SVGZ | Vector Image Files |
| .SVH | Uncommon Files |
| .SVI | Video Files |
| .SVJ | Uncommon Files |
| .SVK | Uncommon Files |
| .SVL | Uncommon Files |
| .SVM | Uncommon Files |
| .SVN | Uncommon Files |
| .SVO | Uncommon Files |
| .SVP | Uncommon Files |
| .SVQ | Uncommon Files |
| .SVQ?? | Uncommon Files |
| .SVR | Web Files |
| .SVR4B | Uncommon Files |
| .SVR4L | Uncommon Files |
| .SVS | Game Files |
| .SVT | Uncommon Files |
| .SVU | Uncommon Files |
| .SVUE | Uncommon Files |
| .SVV | Uncommon Files |
| .SVW | Uncommon Files |
| .SVX | GIS Files |
| .SVY | Uncommon Files |
| .SVZ | Uncommon Files |
| .SW | Audio Files |
| .SW0 | Uncommon Files |
| .SW1 | Uncommon Files |
| .SW2 | Uncommon Files |
| .SW3 | Uncommon Files |
| .SW4 | Uncommon Files |
| .SW5 | Uncommon Files |
| .SW6 | Uncommon Files |
| .SW7 | Uncommon Files |
| .SW8 | Uncommon Files |
| .SW9 | Uncommon Files |
| .SWA | Audio Files |
| .SWAP | Uncommon Files |
| .SWAPPER | Uncommon Files |
| .SWB | Uncommon Files |
| .SWC | Game Files |
| .SWD | Developer Files |
| .SWE | Uncommon Files |
| .SWEB | Uncommon Files |
| .SWF | Video Files |
| .SWFS | Uncommon Files |
| .SWG | Uncommon Files |
| .SWH | Uncommon Files |
| .SWI | Video Files |
| .SWING | Uncommon Files |
| .SWITCH | Encoded Files |
| .SWJ | Misc Files |
| .SWK | Data Files |
| .SWL | Uncommon Files |
| .SWM | Disk Image Files |
| .SWN | Uncommon Files |
| .SWO | Uncommon Files |
| .SWP | System Files |
