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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .OD4 | Omnis Software | Database Files | Omnis5 Database File | Omnis Studio | Omnis Software |
| .OD9 | Omnis Software | Database Files | Omnis5 Database File | Omnis Studio | Omnis Software |
| .ODB | Various Developers | Database Files | OpenDocument Database | Apache OpenOffice | Apache Software Foundation |
| .OPT | LexisNexis | Database Files | Concordance Database File | LexisNexis Concordance | LexisNexis |
| .OQY | Microsoft Corporation | Database Files | Excel OLAP Query File | Microsoft Excel | Microsoft Corporation |
| .ORA | Unknown Developer | Database Files | OpenRaster Image File | GIMP | The GIMP Development Team |
| .ORD | OMAX Corporation | Database Files | OMAX Routed Data | Unknown Software | Unknown Developer |
| .OTQ | One MarketData, LLC | Database Files | OneTick Query File | OneTick | One MarketData, LLC |
| .OWC | OutWit Technologies | Database Files | OutWit Catch Database | Mozilla Firefox | Mozilla |
| .OXB | Olapxsoftware | Database Files | OlapX Report Portfolio Data File | OlapX Application | Olapxsoftware |
| .OXC | Olapxsoftware | Database Files | OlapX | OlapX Application | Olapxsoftware |
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