| extension name | file type | Classification |
|---|---|---|
| OGM | Ogg Media File | video file |
| OGV | Ogg Video File | video file |
| OGX | Ogg Vorbis Multiplexed Media File | video file |
| ORV | Oracom Video File | video file |
| OSP | OpenShot Project File | video file |
| OTRKEY | OnlineTvRecorder Encoded Video File | video file |