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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .OBJ | Wavefront Technologies | 3D Image Files | Wavefront 3D Object File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .OBK | O&O Software | 3D Image Files | DiskImage Backup File | O&O DiskImage | O&O Software |
| .OBP | DAZ 3D | 3D Image Files | Bryce Object File | DAZ 3D Bryce | DAZ 3D |
| .OBZ | Smith Micro Software | 3D Image Files | Compressed 3D Object File | Poser | Smith Micro Software |
| .OCT | Radiance Community | 3D Image Files | Radiance Octree File | RADIANCE | Open Source |
| .ODT | Oracle Corporation | 3D Image Files | OpenDocument Text Document | Apache OpenOffice | Apache Software Foundation |
| .OFF | Open Source | 3D Image Files | Object File Format | MeshLab | Open Source |
| .OGF | GSC Game World | 3D Image Files | S.T.A.L.K.E.R. Model File | GSC Game World S.T.A.L.K.E.R.: Call of Pripyat | GSC Game World |
| .OL | Valve | 3D Image Files | Valve Hammer Object Layout File | Valve Hammer Editor | Valve |
| .OLF | Oyez Professional Services | 3D Image Files | OyezForms Legal Document | OyezForms | Oyez Professional Services |
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