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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .OBW | Toontrack | Audio Files | Superior Drummer Sounds File | Superior Drummer | Toontrack |
| .OCDF | Recorded Books | Audio Files | OneClickDigital MP3 Audio Book | OneClickDigital | Recorded Books |
| .ODD | Coby Electronics Corporation | Audio Files | Coby Voice Recorder Data | Coby Voice Manager Software | Coby Electronics Corporation |
| .ODM | Open Source | Audio Files | OpenDocument Master Document | Apache OpenOffice | Apache Software Foundation |
| .OFS | Florin Ghido | Audio Files | OptimFROG Dualstream Data | Nullsoft Winamp | Nullsoft |
| .OGA | Xiph.Org | Audio Files | Ogg Vorbis Audio File | VLC Media Player | VideoLAN |
| .OGG | Xiph.Org | Audio Files | Ogg Vorbis Audio File | VLC Media Player | VideoLAN |
| .OKT | Open Source | Audio Files | Oktalyzer Module | ModPlug Player | Open Source |
| .OLV | Unknown Developer | Audio Files | OnLive! Traveler Sound File | Unknown Software | Unknown Developer |
| .OMA | Sony | Audio Files | Sony OpenMG Music File | Sony SonicStage | Sony |
| .OMF | Avid Technology | Audio Files | Open Media Framework File | Steinberg Cubase | Steinberg |
| .OMG | O&O Software | Audio Files | O&O Image File | O&O DiskImage | O&O Software |
| .OMX | Ots Labs | Audio Files | OtsAV Media Library Information File | OtsAV DJ | Ots Labs |
| .OPUS | Open Source | Audio Files | Opus Audio File | Microsoft Windows Media Player | Microsoft Corporation |
| .ORC | Voyetra Turtle Beach | Audio Files | Voyetra Digital Orchestrator File | Digital Orchestrator | Voyetra Turtle Beach |
| .OSP | Jonathan Thomas | Audio Files | OpenShot Project File | OpenShot | Jonathan Thomas |
| .OTS | Apache Software Foundation | Audio Files | OpenDocument Spreadsheet Template | Apache OpenOffice | Apache Software Foundation |
| .OVE | Sonic Scores | Audio Files | Overture Musical Score | Overture | Sonic Scores |
| .OVW | Apple | Audio Files | Logic Pro Overview File | Logic Pro X | Apple |
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