| qcelp | QCELP Compressed Audio |
| qcp | QCELP Compressed Audio |
| qdx | QDesign Audio |
| qmc3 | QQ Music Encrypted MP3 Audio |
| qsd | QuickScore Elite Music Score |
| qsf | Capcom QSound Audio Data |
| r1m | RealOne Streaming Media Metadata |
| r2a | Yamaha RS-7000 Archive |
| r2p | Yamaha RS-7000 Pattern |
| r2s | Yamaha RS-7000 Song |
| r36 | Recomposer MIDI Sequence |
| r3a | Yamaha RS-7000 Sample |
| r3p | Yamaha RS-7000 Pattern |
| ra | Real Audio Sound |
| rad | Reality AdLib Tracker Song |
| ram | Real Audio Sound |
| rap | Magix Music Studio Rap Data |
| rax | Real Audio Sound |
| rbs | Rebirth Song Data |
| rc2 | ReCycle Audio Loop Data |
| rcp | Recomposer MIDI Sequence |
| rcwv | PMRecorder Recorded Audio |
| rdl | RadioDestiny Radio Stream |
| record | DaveTech GarageBand Records Audio |
| 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 |
