| sph | HTK NIST SPHERE Data |
| spj | Digitrax SoundFX Project |
| spm | StoneTracker Music Module |
| sppack | SPPack Sound Sample |
| sps | StoneTracker Audio Sample |
| spu | Sony Playstation Audio Data |
| spx | Speex Compressed Audio |
| sq | Sony Playstation 2 SCEI Sequence |
| sqt | Technics SX-KN6000 Sequence Data |
| sri | Dragon NaturallySpeaking Audio File |
| sseq | Nintendo DS Sound Data |
| ssf | Sega Saturn Audio Data |
| 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 |
| sts | Pulsar Audio 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 |
| swc | Spanish Whiz Conversation Audio |
| swd | Spanish Whiz Dictation Audio |
| sws | Spanish Whiz Sound Data |
