| extension name | file type | Classification |
|---|---|---|
| OAR | OpenSimulator Archive | Compressed file |
| OPK | GCW Zero Open Package | Compressed file |
| OZ | Opera Job Management Compressed File | Compressed file |
| extension name | file type | Classification |
|---|---|---|
| OAR | OpenSimulator Archive | Compressed file |
| OPK | GCW Zero Open Package | Compressed file |
| OZ | Opera Job Management Compressed File | Compressed file |