| Abbreviation | Definition |
|---|---|
| SMV | Saved Mail Video file |
| SMV | Smith Micro Software VideoLink Mail Video File |
| SMV | Streaming Mobile Video File |
| SN | Compressed song file (Sound Club editor) |
| SND | Sound file ( Sun/ NeXT/ Tandy/ Apple Macintosh Sound file formats) |
| SNF | Message Sniffer rulebase file |
| SNG | Song (midi) |
| SNO | Snobol4 language source code file |
| SNP | Book-shelf for .BOO ( READIBM) |
| SNP | Output video format from Computer Eyes equipment |
| SO | Shared object (Fortran 90) |
| SOL | Game SOLution file |
| SOL | MATRA prelude solids |
| SOM | Quattro Pro Network serial numbers |
| SOM | Sort information (Paradox) |
| SON | Song file |
| SOU | Sound data |
| SP | Compressed file archive (Splint) |
| SPC | Atari Compressed Spectrum file Bitmap graphics |
| SPC | Microsoft Multiplan Program file |