| rso | Lego Mindstorms NXT Brick Audio |
| rti | Real Tracker Instrument |
| rtm | Real Tracker Module |
| rtpl | Nokia Phone Binary Ringtone |
| rts | Real Tracke Sample |
| rttl | Ring Tones Text Transfer Language File |
| rtttl | Ring Tones Text Transfer Language File |
| rtx | Nokia Phone Ringtone |
| rwr | RiffWorks Riff Data |
| rwsd | RWSD Audio Stream |
| rx2 | ReCycle REX 2 Audio |
| s | Pulsar Audio Data |
| s1a | Yamaha EX5 All Data |
| s1m | Yamaha EX5 Waveform Data |
| s1v | Yamaha EX5 Voice Data |
| s24 | Seq24 Pattern Data |
| s2b | Yamaha Custom RAM Voice Data |
| s3i | Scream Tracker 3 Instrument |
| s3m | Scream Tracker 3 Module |
| s3z | Scream Tracker 3 Module |
| s48 | Jutel RadioMan MPEG2 Audio |
| s98 | NEC PC-98 Audio Data |
| sa2 | Surprise! AdLib Tracker v2 Song |
| saf | MusicMatch Jukebox Secure Audio File |
| sag | Sagem Phone Ringtone Data |
| sagem | Sagem Phone Ringtone Data |
| sample | Godot Engine Audio Sample Data |
| sap | Atari SAP Music |
| sat | Surprise! AdLib Tracker v1 Song |
| sb | Signed Byte Audio Data |
