| 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 |
| rhl | EdgeSounds RatHole Compressed Audi |
| rhz | RHZ Ringtone |
| rif | Rockwell ADPCM Format Data |
| ring | Grandstream IP Phone Ringtone |
| rjp | Vectordean Music |
| rka | RK Audio Lossless Compressed Audio |
| rmi | MIDI Music |
| 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 |
