| .OBR | Micro Focus International plc | Ontwikkelaarsbestanden | Borland C++ Object Browser Data | Apache Tomcat | Apache Software Foundation |
| .ODB | Various Developers | Databasebestanden | OpenDocument Database | Apache OpenOffice | Apache Software Foundation |
| .ODC | Microsoft Corporation | Instellingsbestanden | Office Data Connection File | Apache OpenOffice | Apache Software Foundation |
| .ODCCUBEFILE | Apache Software Foundation | Allerlei bestanden | OpenDocument 1 Chart | Apache OpenOffice | Apache Software Foundation |
| .ODF | Oracle Corporation | Allerlei bestanden | OpenDocument Formula | Apache OpenOffice | Apache Software Foundation |
| .ODG | Apache Software Foundation | Vectorafbeeldingen | OpenDocument Graphic File | Apache OpenOffice | Apache Software Foundation |
| .ODI | Apache Software Foundation | Rasterafbeeldingen | OpenDocument Image | Apache OpenOffice | Apache Software Foundation |
| .ODM | Open Source | Tekstbestanden | OpenDocument Master Document | Apache OpenOffice | Apache Software Foundation |
| .ODP | Oracle Corporation | Gegevensbestanden | OpenDocument Presentation | Apache OpenOffice | Apache Software Foundation |
| .ODS | Oracle Corporation | Werkbladbestanden | OpenDocument Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .ODT | Oracle Corporation | Tekstbestanden | OpenDocument Text Document | Apache OpenOffice | Apache Software Foundation |
| .OOS | Apache Software Foundation | Werkbladbestanden | Apache OpenOffice (OpenOffice.org) Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .OOT | Apache HTTP Project Management Committee | Gegevensbestanden | Apache OpenOffice Text Document | Apache OpenOffice | Apache Software Foundation |
| .OTC | Apache Software Foundation | Allerlei bestanden | OpenDocument Chart Template | Apache OpenOffice | Apache Software Foundation |
| .OTG | Apache Software Foundation | Vectorafbeeldingen | OpenDocument Graphic Template | Apache OpenOffice | Apache Software Foundation |
| .OTH | Apache Software Foundation | Webbestanden | OpenDocument HTML Template | Apache OpenOffice | Apache Software Foundation |
| .OTI | Apache Software Foundation | Rasterafbeeldingen | OpenDocument Image Template | Apache OpenOffice | Apache Software Foundation |
| .OTP | Oracle Corporation | Gegevensbestanden | OpenDocument Presentation | Apache OpenOffice | Apache Software Foundation |
| .OTS | Apache Software Foundation | Werkbladbestanden | OpenDocument Spreadsheet Template | Apache OpenOffice | Apache Software Foundation |
| .OTT | Apache Software Foundation | Tekstbestanden | OpenDocument Document Template | Apache OpenOffice | Apache Software Foundation |
| .OXT | Sun Microsystems | Plug-inbestanden | Apache OpenOffice Extension | Apache OpenOffice | Apache Software Foundation |
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