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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .O2C | Eleco Software GmbH | Graphic Files | Objects To See 3D File Format | Objects to See | Eleco Software GmbH |
| .O3D | Graphic Files | Google Open 3D Web Graphic Format | Google Chrome | ||
| .OCC | MathWorks | Graphic Files | Oceanic DataPool File | The MathWorks MATLAB | MathWorks |
| .ONX | Onyx Computing | Graphic Files | OnyxGrass Image | OnyxGrass | Onyx Computing |
| .OOG | Python Software Foundation | Graphic Files | PyGraph Python Graphics Interface Object Oriented Graphics | Python | Python Software Foundation |
| .OSP | Jonathan Thomas | Graphic Files | OpenShot Project File | OpenShot | Jonathan Thomas |
| .OTO | Open Source | Graphic Files | AutoPano Project | AutoPano | Kolor |
| .OVF | VMware | Graphic Files | Open Virtualization File | VMware Workstation | VMware |
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