| rel | Nokia 5510 Phone Recorded Audio |
| rex | ReCycle Loop Data |
| rex2 | ReCycle REX 2 Audio |
| rf64 | RF64 Audio Data |
| rfl | Reason ReFill Sound Bank |
| rg | Rosegarden Music |
| rgtrack | RealStrat Music Track |
| rh | RobHubbard 2 Audio Data |
| rhl | EdgeSounds RatHole Compressed Audi |
| rhz | RHZ Ringtone |
| rif | Rockwell ADPCM Format Data |
| ring | Grandstream IP Phone Ringtone |
| rix | Softstar RIX OPL Music Format Audio |
| rjp | Vectordean Music |
| rka | RK Audio Lossless Compressed Audio |
| rmf | Rich Music Format Audio File |
| rmi | MIDI Music |
| rmid | RIFF Based Midi Format Data |
| rmj | RealJukebox Unsecure Media Clip |
| rmt | RASTER Music Tracker Song |
| rmx | RealJukebox Secure Media Clip |
| rng | Nokia Phone Ringtone |
| rni | Renoise Instruments Data |
| rns | Reason Audio |
| Renoise Song Data |
| rol | AdLib Visual Composer Music |
| rso | Lego Mindstorms NXT Brick Audio |
| rti | RASTER Music Tracker Instrument |
| Real Tracker Instrument |
| rtm | Real Tracker Module |
| rtpl | Nokia Phone Binary Ringtone |
| rts | Real Tracker 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 | Akai S900 Sample |
| 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 |
| sa2b | A2B Player Stream |
| sab | ALSong Album |
| saf | MusicMatch Jukebox Secure Audio File |
| sag | Sagem Phone Ringtone Data |
| sagem | Sagem Phone Ringtone Data |
| samp | Nintendo Wii ADPCM Sample |
| sample | Godot Engine Audio Sample Data |
| sap | Atari SAP Music |
| sat | Surprise! AdLib Tracker v1 Song |
| sb | Signed Byte Audio Data |
| sbi | Creative Labs Sound Blaster Instruments |
| sbk | EMU SoundFont v1.x Banks |
| sbnk | Nintendo DS Sound Bank Data |
| sbw | ScadaWorks Voice Wave Data |
| sb_ | Compressed Creative Labs Sound Blaster Instruments |
| sc | SoundControl Audio |
| sc2 | Sample Cell II Instrument Data |
| sc68 | SC68 Music |
| sci | Sierra AdLib Audio Data |
| scm | Spanish Whiz Scrambled Game Sound |
| sco | CSound Score Data |
| scs11 | Show Cue System Cue |
| sd | ESPS Sampled Data |
| 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 |
