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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .XOF | Themekit Systems Ltd | 3D Image Files | Reality Lab 3D Image File | MindRender Virtual Reality Explorer Kit | Themekit Systems Ltd |
| .XPR | Parametric Technology Corporation | 3D Image Files | Pro/ENGINEER Part Instance Accelerator File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .XRF | Open Source | 3D Image Files | Cal3D XML Materials File | Cal3DViewer | Open Source |
| .XSF | Microsoft Corporation | 3D Image Files | InfoPath Form Definition File | Microsoft InfoPath | Microsoft Corporation |
| .XSI | Autodesk, Inc. | 3D Image Files | Softimage XSI 3D Image | Okino Computer Graphics PolyTrans | Okino Computer Graphics |
| .XTC | SourceForge | 3D Image Files | XTrkCAD Project | XTrackCAD | SourceForge |
| .YDL | Silicon Graphics, Inc. | 3D Image Files | PowerFlip YAODL 3D Image File | YAODL | Silicon Graphics, Inc. |
| .YPT | Rockstar Games | 3D Image Files | GTA 5 Particle Data | Grand Theft Auto (GTA) | Rockstar Games |
| .Z3D | Zanoza Software | 3D Image Files | ZModeler 3D File | Zanoza ZModeler | Zanoza Software |
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