| scs11 | Show Cue System Cue |
| sd | Sound Designer Audio |
| sd2 | Sound Designer 2 Audio |
| sd2f | Sound Designer 2 Sound |
| sdat | Nitro Composer Sound Data |
| sdb | Herbulot AdLib System Audio |
| sdc | BigPond Music Song |
| sdif | Sound Description Interchange Format |
| sdii | Sound Designer 2 Audio |
| sds | MIDI Sample Dump Standard |
| sdx | MIDI Sample Dump Exchange |
| seq | Akai MPC2500 Sequence Data |
| seq | Sony PlayStation MIDI Sequence |
| sf | IRCAM SoundFile |
| sf2 | EMU SoundFont v2.x Banks |
| sfa | Sonic Foundry Audio File |
| sfark | sfArk Compressed SoundFont |
| sfd | SoundStage Sound File Data |
| sfi | SoundStage Sound File Info |
| sfk | Modem Spy Recorded Audio |
| sfk | Sound Forge Peak Data |
| sfl | Sound Forge Audio Data |
| sfpack | SFPack Compressed SoundFont |
| sfr | Sonic Foundry Sample Resource |
| sfx | SoundFX Audio File |
| sfx2 | SoundFX Audio File |
| sg2 | Band-in-a-Box Song |
| sg4 | Band-in-a-Box Song |
| sga | Self-Guard Security Camera Audio |
| sgt | Microsoft DirectMusic Producer Segments Data |
