| ofg | OptimFROG Dualstream Audio |
| ofr | OptimFROG Lossless Audio |
| oga | Ogg Vorbis Compressed Audio |
| ogg | Ogg Vorbis Compressed Audio |
| ogx | Ogg Vorbis Compressed Audio |
| okt | Oktalyzer Music Module |
| olv | OnLive! Traveler Sound |
| oma | Sony ATRAC3 Compressed Audio |
| omg | Sony ATRAC3 Compressed Audio |
| omg | Sony OpenMG Audio |
| oml | OtsAV Media Library |
| omx | OtsAV Media Library Information |
| opus | Opus Audio File |
| orc | Voyetra Digital Orchestrator Pro Song |
| ots | OtsAV Album |
| p4x | The Player 4.x Music |
| p50 | The Player 5.0a Module |
| pac | SBStudio II Song Package |
| pca | Sony Perfect Clarity Audio |
| pcg | Korg Trinity Instrument Bank |
| pcm | RAW PCM Audio Data |
| pk7 | Casio WK-6500 PK7 Package |
| plm | Panasonic SD Voice Editing File |
| plst | SmartMusic Playlist |
| pna | PhatNoise Audio |
| pno | Microsoft Windows 8 Piano Song |
| ppc | Adobe Presenter Audio |
| ppcx | Adobe Presenter Audio |
| pru2 | Prorunner 2.0 Music |
| psg | ZX Spectrum 128 Audio |
