| .rmv |
Radical Entertainment Video File |
| .swf |
Shockwave Flash Movie |
| .srt |
SubRip Subtitle File |
| .sqz |
Squeeze Project File |
| .smil |
SMIL Presentation File |
| .swi |
SWiSH Project File |
| .scm |
StarCraft Map File |
| .stl |
Stereolithography File |
| .stx |
Pinnacle Studio Project File |
| .scn |
OpenTTD Scenario File |
| .seq |
PowerTracks Pro Audio Project File |
| .snagproj |
Snagit Project File |
| .sec |
PGP Secret Key Ring |
| .sbz |
ShowBiz Project File |
| .ssm |
Standard Streaming Metafile |
| .svi |
Samsung Video File |
| .sbk |
sound font files |
| .str |
PlayStation Video Stream |
| .sfvidcap |
Sonic Foundry Video Capture File |
| .smk |
Smacker Compressed Movie File |
| .swt |
Flash Generator Template |
| .smi |
Self-Mounting Disk Image |
| .ssf |
Trimble Standard Storage Format File |
| .scc |
SourceSafe Source Code Control File |