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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .OB | Innoshock | Backup Files | Orbit Downloader Incomplete Download | Orbit Downloader | Innoshock |
| .OBK | O&O Software | Backup Files | DiskImage Backup File | O&O DiskImage | O&O Software |
| .OCH | WorldWideSatellites | Backup Files | Satellite And Channel Settings Backup | Viewsat Pro | WorldWideSatellites |
| .OEB | IDPF (International Digital Publishing Forum) | Backup Files | Open eBook File | Adobe InDesign | Adobe Systems Incorporated |
| .OFB | Oxgen Forensics | Backup Files | Oxygen Forensic Suite Backup | Oxygen Forensic Detective | Oxgen Forensics |
| .OLD | Unknown Developer | Backup Files | Backup Archive File | Unknown Software | Unknown Developer |
| .ONEPKG | Microsoft Corporation | Backup Files | Microsoft OneNote Package File | Microsoft OneNote | Microsoft Corporation |
| .ORI | Unknown Developer | Backup Files | Original File | Unknown Software | Unknown Developer |
| .ORIG | Unknown Developer | Backup Files | Original File | Unknown Software | Unknown Developer |
| .OVB | OnkoS | Backup Files | OnkoS Vocabulary Backup | Unknown Software | Unknown Developer |
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