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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .OAS | Fujitsu Limited | Text Files | Fujitsu OAS Document File | OASYS Viewer | Fujitsu Limited |
| .OCR | URUWORKS | Text Files | Subtitle Workshop OCR Script | URUWorks Subtitle Workshop | URUWORKS |
| .ODIF | ITU-T (International Telecommunication Union, Telecommunication Standardization Sector) | Text Files | Open Document Interchange Format | Unknown Software | Unknown Developer |
| .ODM | Open Source | Text Files | OpenDocument Master Document | Apache OpenOffice | Apache Software Foundation |
| .ODT | Oracle Corporation | Text Files | OpenDocument Text Document | Apache OpenOffice | Apache Software Foundation |
| .OLI | Olivetti | Text Files | Olivetti Text File | Olitext Plus | Olivetti |
| .OMN | Unknown Developer | Text Files | Omnipotent Collection Data | Unknown Software | Unknown Developer |
| .OPT | LexisNexis | Text Files | Concordance Database File | LexisNexis Concordance | LexisNexis |
| .ORO | The Three-Mode Company | Text Files | 3WayPack T3Rotate Output | 3WayPack | The Three-Mode Company |
| .OSC | OpenStreetMap | Text Files | OpenStreetMap Change File | Merkaartor | Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others |
| .OTT | Apache Software Foundation | Text Files | OpenDocument Document Template | Apache OpenOffice | Apache Software Foundation |
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