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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .3B | Pilgway | 3D Image Files | 3D-Coat Project | 3D-Coat | Pilgway |
| .3D | Interscape | 3D Image Files | 3D Drawing CAD Data | Quick3D | quick3D |
| .3D4 | Atari Corporation | 3D Image Files | Stereo CAD-3D 2.0 Image File | Quick3D | quick3D |
| .3DA | Unknown Developer | 3D Image Files | 3D Assembly File | Zanoza ZModeler | Zanoza Software |
| .3DF | Informative Graphics Corporation | 3D Image Files | 3D Format | Myriad | Informative Graphics Corporation |
| .3DG | RomanLab Software | 3D Image Files | 3D Grapher | 3D Grapher | RomanLab Software |
| .3DH | New York State Department of Transportation | 3D Image Files | 3D Highway Base Map | Unknown Software | Unknown Developer |
| .3DM | Redway3d and others | 3D Image Files | Rhino 3D Model | Autodesk Fusion 360 | Autodesk, Inc. |
| .3DP | Futuremark Corporation | 3D Image Files | 3DMark2011 SE Project File | Futuremark 3DMark | Futuremark Corporation |
| .3DS | Autodesk, Inc. | 3D Image Files | 3D Studio Scene | MAXON Cinema 4D | MAXON Computer |
| .3DV | Web3D Consortium | 3D Image Files | 3D VRML World | IMSI TurboCAD Deluxe | Redway3d and others |
| .3DW | Leadwerks Software | 3D Image Files | 3D World Studio File | Leadwerks Game Engine | Leadwerks Software |
| .3DXML | Dassault Systèmes | 3D Image Files | Dassault Systemes 3D XML File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .3FS | Larry Short, Mick Amadio and Puppy community | 3D Image Files | Puppy Linux Save State File | Puppy Linux | Larry Short, Mick Amadio and Puppy community |
| .3KO | NGRAIN | 3D Image Files | NGRAIN 3D Format | NGRAIN SDK | NGRAIN |
| .3MF | Open Source | 3D Image Files | 3D Manufacturing File | Paint 3D | Microsoft Corporation |
| .3PG | Unknown Developer | 3D Image Files | 3D Digital Gallery Data | Unknown Software | Unknown Developer |
| .3PI | El Dorado Software | 3D Image Files | 3rd PlanIt Data | 3rd PlanIt | El Dorado Software |
| .3XE | Global Majic Software | 3D Image Files | 3DLinX Entity Data | 3DLinX | Global Majic Software |
| .906 | Calcomp | 3D Image Files | Calcomp Plotter File | Extended ECM | SAP |
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