File - Extensions - O -
| EXTENSION | File - DESCRIPTION |
|---|---|
| .O01 | Typhoon voice file |
| .OBD | Microsoft Office binder template |
| .OBJ | Compiler OBJect file |
| .OBJ | Metatools' Bryce Support file (OBJects) |
| .OBT | MS Office Binder Template |
| .OBZ | Microsoft Office Binder Wizard |
| .OCA | Visual Basic control typelib cache |
| .OCX | Microsoft Object Linking and Embedding custom control |
| .ODF | Open Document Interchange Format (ODIF) |
| .ODS | Microsoft Outlook Express mailbox file |
| .OFF | 3D Object file Format |
| .OFN | Microsoft Office fileNew file |
| .OFT | Microsoft Outlook template |
| .OKT | Oktalyzer music module (MOD) file |
| .OLB | OLE Object Library |
| .OLD | Backup file |
| .OLE | OLE object |
| .OMF | Avid video editor interchange files |
| .OOGL | Object Oriented Graphics Library |
| .OPL | Organiser Programming Language source file - Psion/Symbian |
| .OPO | OPL output executable file |
| .OPT | Configuration information (OPTions) used by several programs |
| .OPX | OPL extension DLL |
| .OR2 | Lotus Organiser 2 file |
| .OR3 | Lotus Organiser 97 file |
| .ORA | Oracle 7 configuration |
| .ORC | Oracle 7 script |
| .ORG | Lotus Organiser file |
| .OSS | Microsoft Office Search file |
| .OST | Microsoft Exchange/Outlook Offline file |
| .OST | Microsoft Inbox offline folder file |
| .OTL | Super NoteTab template file (Fookes) |
| .OUT | C language output file |
| .OVL | OVerLay, program code for DOS |
| .OYZ | Lotus Approach alternate dBASE index |
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