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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .ORD | OMAX Corporation | Data Files | OMAX Routed Data | Unknown Software | Unknown Developer |
| .ORG | IBM | Data Files | Lotus Organizer File | IBM Lotus Organizer | IBM |
| .ORIGINAL | NetObjects | Data Files | Netobjects Fusion Components Bbscomp Message Data | NetObjects Fusion | NetObjects |
| .ORM | Ormetis S.A.S. | Data Files | Ormetis Workbench Data | Ormetis | Ormetis S.A.S. |
| .ORP | PV & Associates | Data Files | WinSLAM File | WinSLAMM | PV & Associates |
| .OS | Open Source | Data Files | ObjectScript Source File | ObjectDevel | Open Source |
| .OSA | Symantec Corporation | Data Files | W32/Sober-AD File | AVG Antivirus | AVG Technologies |
| .OSD | Microsoft Corporation | Data Files | Open Software Description Data | Microsoft Application Virtualization | Microsoft Corporation |
| .OSI | Jamie Wilkinson | Data Files | Osiris Database | Osiris | Jamie Wilkinson |
| .OSL | Ockam Instruments | Data Files | OckamSoft Log File | OckamSoft | Ockam Instruments |
| .OSMALLER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .OSZ | Ppy Pty Ltd | Data Files | Osu! Beatmap File | osu! | Ppy Pty Ltd |
| .OT | Open Source | Data Files | TheWord Old Testament Text Module | theWord | Costas stergiou |
| .OTL | Fookes Software | Data Files | NoteTab Outline File | NoteTab | Fookes Software |
| .OTN | Nuance | Data Files | OmniPage Training File | OmniPage | Nuance |
| .OTP | Oracle Corporation | Data Files | OpenDocument Presentation | Apache OpenOffice | Apache Software Foundation |
| .OTX | Open Source | Data Files | TheWord Encrypted Old Testament Text Module | theWord | Costas stergiou |
| .OUT | Open Source | Data Files | Compiled Executable File | Linux | Open Source |
| .OUV | Le Sphinx | Data Files | Sphinx Open Ended Responses Data | Sphinx | Le Sphinx |
| .OV | Revelation Software | Data Files | OpenInsight Database Overflow Data | OpenInsight | Revelation Software |
| .OVA | VMware | Data Files | Open Virtual Appliance | VMware Workstation | VMware |
| .OVD | Elias Fotinis | Data Files | OverDisk Database | OverDisk | Elias Fotinis |
| .OVF | VMware | Data Files | Open Virtualization File | VMware Workstation | VMware |
| .OVLX | Rick Meyers | Data Files | E-Sword Overlay Data | e-Sword | Rick Meyers |
| .OVX | Psion PLC | Data Files | Object-based Visual Application Language File | Psion OVAL | Psion PLC |
| .OWC | OutWit Technologies | Data Files | OutWit Catch Database | Mozilla Firefox | Mozilla |
| .OWF | OSRAM GmbH | Data Files | OSRAM Waveform File | Unknown Software | Unknown Developer |
| .OZD | Symantec Corporation | Data Files | Win32.TrojanDownloader.Agent.OZD Trojan | Avira Antivirus Pro 2016 | Avira Operations GmbH & Co. KG. |
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