| ssnd | Synclavier Sound |
| stem | Native Instruments Stems Audio Data |
| stk | Soundtracker Music |
| stm | Scream Tracker Module |
| strm | Nintendo DS Audio Stream |
| struma | Strum Acoustic GS-1 Exchange Data |
| strume | Strum Electric GS-1 Exchange Data |
| stz | Scream Tracker 2 Module |
| svd | Roland Saved Patches |
| svq | Roland MC-80 Music Sequence |
| svx | Amiga 8SVX Sound |
| sw | Signed Word Audio File |
| swa | Shockwave Audio |
| swav | Nintendo DS Waveform Audio |
| sxq | MPC Midi Sequence |
| sxt | Propellerheads Reason NN-XT Format Data |
| sy1 | Synth1 Sound Bank |
| syh | Synchomatic Instrument |
| syw | Yamaha SY Series Sample |
| tak | TAK Compressed Audio |
| tfe | TFM Music Maker Music |
| tfi | TFM Music Maker Instruments Data |
| tfmx | Final Musicsystem EXtended Module |
| thd | Dolby TrueHD Audio Stream |
| thx | Amiga THX Tracker Music |
| tir | TuneIn Radio Recording Stream |
| tjn | Taijin Media Net Karaoke Song |
| tjs | Trackjoy GUS Tracker Song |
| tkm | Panasonic SD Voice Editor Data |
| tl | OpenTL Data |