| 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 |
| rmi | MIDI Music |
| rmid | RIFF Based Midi Format Data |
| rmj | RealJukebox Unsecure Media Clip |
| rmx | RealJukebox Secure Media Clip |
| rng | Nokia Phone Ringtone |
| rni | Renoise Instruments Data |
| rns | Reason Audio |
| rol | AdLib Visual Composer Music |
| 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 |
| 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 |
