| File Extensions |
Description |
M |
A |
Modified |
Index |
| O | SCO Unix Driver | . | M | 2.06.00 | 1302 |
| O01 | Typhoon Voice File | . | L | 2.00.00 | 905 |
| O?C | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| O?F | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| O?G | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| O?I | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| O?T | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| OAB | MS Outlook Address Book | . | M | 2.19.02 | 1178 |
| OB3 | ORTIM Zeit Data | . | M | 2.32.00 | 4066 |
| OBD | MS Compound Document (OLE) (General) | Y | H | 3.01.03 | 274 |
| OBD | MS Office Binder Document/Template/Wizard | Y | H | 2.26.00 | 326 |
| OBJ | Advanced Visualizer 3D Object (ASCII) | . | M | 2.17.00 | 1158 |
| OBJ | Compiler Object | . | M | 2.18.00 | 126 |
| OBK | PSpice Capture Design/Library/Symbols | Y | H | 2.27.00 | 331 |
| OBS | ObjectScript | . | M | 2.26.00 | 3547 |
| OBT | MS Office Binder Document/Template/Wizard | Y | H | 2.26.00 | 326 |
| OBZ | MS Office Binder Document/Template/Wizard | Y | H | 2.26.00 | 326 |
| OCC | DB/TextWorks Database Terms and Words | . | M | 2.32.00 | 4067 |
| OCI | openCanvas Image | . | M | 2.32.00 | 4068 |
| OCX | MS Windows .NET Library (32 bit) | Y | H | 2.18.00 | 2686 |
| OCX | MS Windows .NET Library (64 bit) | Y | H | 2.18.00 | 2685 |
| OCX | MS Windows Library (32 bit) | Y | H | 2.03.10 | 325 |
| OCX | MS Windows Library (64 bit) | Y | H | 2.18.00 | 2684 |
| OD? | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| ODB | OpenOffice Database | Y | H | 2.21.00 | 2615 |
| ODC | OpenDocument Chart | Y | H | 2.21.00 | 2488 |
| ODF | OpenDocument Formula | Y | H | 2.21.00 | 2490 |
| ODG | OpenDocument Graphics | Y | H | 2.21.00 | 2492 |
| ODI | OpenDocument Image | Y | H | 2.21.00 | 2494 |
| ODL | MS Visual C++ Object Description Lang. | . | M | 2.03.11 | 407 |
| ODM | OverDrive Media Console Media Control | . | M | 2.26.00 | 3587 |
| ODP | OpenDocument Presentation | Y | H | 2.21.00 | 2496 |
| ODS | OpenDocument Spreadsheet | Y | H | 2.21.00 | 2498 |
| ODT | MindRender VREK Object | . | M | 2.07.00 | 1500 |
| ODT | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| ODT | OpenDocument Text | Y | H | 2.21.00 | 2500 |
| OFC | Open Financial Connectivity File | . | M | 2.32.00 | 4069 |
| OFF | Object Oriented Graphics Library: Objects (ASCII) | . | M | 2.23.01 | 2551 |
| OFF | Object Oriented Graphics Library: Objects (Binary) | . | M | 2.17.00 | 2552 |
| OFM | OmniForm Form | Y | H | 2.27.00 | 2515 |
| OFR | OptimFROG Encoded Audio | . | M | 2.09.00 | 1719 |
| OFT | MS Outlook Form Template | Y | H | 2.17.00 | 909 |
| OGA | OGG Vorbis Compressed Audio | . | M | 2.24.00 | 1537 |
| OGG | OGG FLAC Compressed Audio | . | M | 2.24.00 | 2922 |
| OGG | OGG Vorbis Compressed Audio | . | M | 2.24.00 | 1537 |
| OGG | OGG Vorbis Compressed Audio (MacBinary) | . | M | 2.16.00 | 2451 |
| OGM | OGG Vorbis Compressed Video | . | M | 2.26.00 | 1934 |
| OGM | OGG Vorbis Compressed Video (MacBinary) | . | M | 2.26.00 | 3593 |
| OGV | OGG Vorbis Compressed Video | . | M | 2.26.00 | 1934 |
| OGV | OGG Vorbis Compressed Video (MacBinary) | . | M | 2.26.00 | 3593 |
| OKT | Oktalyzer Tracker Music Module | . | M | 2.14.00 | 910 |
| OLB | MS OLE Object Library | . | L | 2.00.00 | 911 |
| OLB | MS Windows OLE Type Library | . | M | 2.11.00 | 100 |
| OLB | PSpice Capture Design/Library/Symbols | Y | H | 2.27.00 | 331 |
| OLD | Backup File (Unknown Source) | . | L | 1.05.00 | 506 |
| OLR | Openlab Raw Format | . | M | 2.32.00 | 4070 |
| OLRW | Openlab Raw Format | . | M | 2.32.00 | 4070 |
| OMA | Sony OpenMG Music Format | . | M | 2.15.00 | 2383 |
| OMX | OMAX Make Tool Path Data | . | M | 2.32.00 | 4071 |
| OMX | OtsAV Media Library Information | . | M | 2.32.00 | 4072 |
| ONE | OneNote Note | . | M | 2.15.00 | 2376 |
| ONE | OneNote Note (XML) | Y | H | 2.35.02 | 4226 |
| ONE | Semone Archive | . | M | 2.15.00 | 473 |
| OOP | OOP Compressed Archive | . | M | 2.08.00 | 1620 |
| OPA | Kodak Photo CD overview pack | . | M | 2.22.00 | 3053 |
| OPC | MS Office Upgarde Control Data | . | M | 2.32.00 | 4073 |
| OPD | Durango Interferometry Document | . | M | 2.32.00 | 4074 |
| OPD | OmniPage Document | Y | H | 2.27.00 | 3652 |
| OPF | Obsidium Project | . | M | 2.11.00 | 1976 |
| OPF | Open eBook Forum Publication | . | H | 2.21.00 | 2924 |
| OPI | OmniPass Exported User | . | M | 2.32.00 | 4075 |
| OPJ | OrCAD Capture Project | . | M | 1.03.00 | 332 |
| OPJ | Origin Project | . | M | 2.26.00 | 3568 |
| OPK | Origin Analysis Pack | . | M | 2.32.00 | 4076 |
| OPO | Symbian Organiser Executable | . | M | 2.21.00 | 913 |
| OPS | MS Office Profile Settings | . | M | 2.07.00 | 1408 |
| OPT | MS Developer Studio Workspace Options | Y | H | 2.17.00 | 914 |
| OPT | PhotoScore Document | . | M | 2.32.00 | 4077 |
| OPX | OrgPlus Organization Chart | . | M | 2.17.00 | 915 |
| OPX | Symbian Library | . | M | 2.21.00 | 3035 |
| OR2 | Lotus Organizer File | . | M | 2.19.00 | 916 |
| OR3 | Lotus Organizer File | . | M | 2.19.00 | 916 |
| ORA | Oracle 7 Configuration File | . | M | 2.03.06 | 917 |
| ORC | Oracle 7 Script | . | L | 2.00.00 | 918 |
| ORG | America Online Personal File Cabinet | . | M | 2.16.00 | 1335 |
| ORG | CMS Organ Music | . | M | 1.00.00 | 29 |
| ORG | Label Factory Deluxe Template | . | M | 2.14.00 | 2228 |
| ORG | Lotus Organizer File | . | M | 2.19.00 | 916 |
| OSB | OpenStreetMap GPS Data | . | M | 2.32.00 | 4078 |
| OSC | OptionScope Worksheet | . | M | 2.32.00 | 4079 |
| OSD | Extensible Markup Language | Y | H | 2.17.01 | 342 |
| OSD | Extensible Markup Language (MacBinary) | . | M | 2.09.00 | 1772 |
| OSS | MS Office Saved Search | . | L | 2.00.00 | 919 |
| OST | MS Exchange/Outlook Offline Storage | . | M | 2.12.00 | 920 |
| OT? | OpenDocument Office Document | Y | H | 2.21.00 | 1499 |
| OTC | OpenDocument Chart Template | Y | H | 2.21.00 | 2489 |
| OTF | Adobe PostScript Compact Font (MacBinary) | . | M | 2.26.00 | 3515 |
| OTF | OpenDocument Formula Template | Y | H | 2.21.00 | 2491 |
| OTF | OpenType Compact Font Format | . | M | 2.11.00 | 1303 |
| OTG | OpenDocument Graphics Template | Y | H | 2.21.00 | 2493 |
| OTH | OpenDocument Text Web | Y | H | 2.21.00 | 2503 |
| OTI | OpenDocument Image Template | Y | H | 2.21.00 | 2495 |
| OTL | Fookes Super NoteTab Template | . | L | 2.00.00 | 921 |
| OTM | OpenDocument Text Master | Y | H | 2.21.00 | 2501 |
| OTO | Autopano Project | . | M | 2.32.00 | 4080 |
| OTP | OpenDocument Presentation Template | Y | H | 2.21.00 | 2497 |
| OTRKEY | OnlineTvRecorder Encoded Video | . | M | 2.32.00 | 4081 |
| OTS | OpenDocument Spreadsheet Template | Y | H | 2.21.00 | 2499 |
| OTT | OpenDocument Text Template | Y | H | 2.21.00 | 2502 |
| OVE | Cakewalk Overture Score | . | M | 2.32.00 | 1095 |
| OVL | Apple ][ Program Overlay | . | M | 2.29.00 | 3928 |
| OVL | DOS Program | Y | M | 1.00.00 | 15 |
| OVL | Program Overlay | . | M | 1.00.00 | 27 |
| OVn | Program Overlay | . | M | 1.00.00 | 27 |
| OVR | Program Overlay | . | M | 1.00.00 | 27 |
| OZF2 | OziExplorer Map (Binary) | . | M | 2.32.00 | 4082 |
