| .3B | Pilgway | 3D bildfiler | 3D-Coat Project | 3D-Coat | Pilgway |
| .3D | Interscape | 3D bildfiler | 3D Drawing CAD Data | Quick3D | quick3D |
| .3D4 | Atari Corporation | 3D bildfiler | Stereo CAD-3D 2.0 Image File | Quick3D | quick3D |
| .3DA | Unknown Developer | 3D bildfiler | 3D Assembly File | Zanoza ZModeler | Zanoza Software |
| .3DF | Informative Graphics Corporation | 3D bildfiler | 3D Format | Myriad | Informative Graphics Corporation |
| .3DG | RomanLab Software | 3D bildfiler | 3D Grapher | 3D Grapher | RomanLab Software |
| .3DH | New York State Department of Transportation | 3D bildfiler | 3D Highway Base Map | Unknown Software | Unknown Developer |
| .3DM | Redway3d and others | 3D bildfiler | Rhino 3D Model | Autodesk Fusion 360 | Autodesk, Inc. |
| .3DP | Futuremark Corporation | 3D bildfiler | 3DMark2011 SE Project File | Futuremark 3DMark | Futuremark Corporation |
| .3DS | Autodesk, Inc. | 3D bildfiler | 3D Studio Scene | MAXON Cinema 4D | MAXON Computer |
| .3DV | Web3D Consortium | 3D bildfiler | 3D VRML World | IMSI TurboCAD Deluxe | Redway3d and others |
| .3DW | Leadwerks Software | 3D bildfiler | 3D World Studio File | Leadwerks Game Engine | Leadwerks Software |
| .3DXML | Dassault Systèmes | 3D bildfiler | Dassault Systemes 3D XML File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .3FS | Larry Short, Mick Amadio and Puppy community | 3D bildfiler | Puppy Linux Save State File | Puppy Linux | Larry Short, Mick Amadio and Puppy community |
| .3KO | NGRAIN | 3D bildfiler | NGRAIN 3D Format | NGRAIN SDK | NGRAIN |
| .3MF | Open Source | 3D bildfiler | 3D Manufacturing File | Paint 3D | Microsoft Corporation |
| .3PG | Unknown Developer | 3D bildfiler | 3D Digital Gallery Data | Unknown Software | Unknown Developer |
| .3PI | El Dorado Software | 3D bildfiler | 3rd PlanIt Data | 3rd PlanIt | El Dorado Software |
| .3XE | Global Majic Software | 3D bildfiler | 3DLinX Entity Data | 3DLinX | Global Majic Software |
| .906 | Calcomp | 3D bildfiler | Calcomp Plotter File | Extended ECM | SAP |
| .A2C | Carnegie Mellon University | 3D bildfiler | Alice Object File | Alice | Carnegie Mellon University |
| .A3D | AlternativaPlatform | 3D bildfiler | Alternativa Player 3D Export File | AlternativaPlayer | AlternativaPlatform |
| .AAS | Adobe Systems Incorporated | 3D bildfiler | Adobe Authorware Shocked Packet File | Adobe Authorware | Adobe Systems Incorporated |
| .ABM FILE EXTENSION | ArcSoft | 3D bildfiler | Album File | Konvertor | Logipole |
| .AC | GNU Operating System | 3D bildfiler | Autoconf Script | GNU Autoconf | GNU Operating System |
| .ADOC | Stuart Rackham | 3D bildfiler | AsciiDoc File | Microsoft Notepad | Microsoft Corporation |
| .AEB | Vero Software | 3D bildfiler | Alphacam Wire EDM VB Macro File | Planit Alphacam | Planit Solutions, Inc. |
| .AF | Serif | 3D bildfiler | 3DPlus Model | 3DPlus | Serif |
| .AGL | Oracle Corporation | 3D bildfiler | Agile XML Archive | Agile Product Lifecycle Management | Oracle Corporation |
| .AM | GNU Operating System | 3D bildfiler | Automake Makefile Template | Automake | GNU Operating System |
| .AMF | Autodesk, Inc. | 3D bildfiler | Additive Manufacturing File | Autodesk Meshmixer | Autodesk, Inc. |
| .AN8 | Steven Glanville | 3D bildfiler | Anim8or File | Anim8or | Steven Glanville |
| .ANIM | Autodesk, Inc. | 3D bildfiler | Maya Animation File | Autodesk Maya | Autodesk, Inc. |
| .ANM | Unknown Developer | 3D bildfiler | 3D Animation File | CRYENGINE | Crytek |
| .AOF | Abvent Group | 3D bildfiler | Artlantis Object File | Artlantis Studio | Abvent Group |
| .AOI | Open Source | 3D bildfiler | Art Of Illusion 3D Scene | Art of Illusion | Open Source |
| .APN | Alpine Electronics | 3D bildfiler | Alpine Wallpaper | Unknown Software | Unknown Developer |
| .APR | ESRI | 3D bildfiler | ArcView Project File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .ASC | Symantec Corporation | 3D bildfiler | PGP (Pretty Good Privacy) ASCII Armored File | Mozilla Thunderbird | Mozilla |
| .ASE | Adobe Systems Incorporated | 3D bildfiler | Adobe Swatch Exchange File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ATF | Molecular Devices | 3D bildfiler | Axon Text File | Microsoft Excel | Microsoft Corporation |
| .ATL | Abvent Group | 3D bildfiler | Artlantis 3D Scene File | Artlantis Studio | Abvent Group |
| .ATM | E-on Software, Inc. | 3D bildfiler | Vue Atmospheres File | E-on Vue | E-on Software, Inc. |
| .AUD | Interscape | 3D bildfiler | Video Game Compressed Audio File | Command and Conquer | Interscape |
| .AVT | SavySoda | 3D bildfiler | Avatar For iPhone Avatar File | Avatar for iPhone | SavySoda |
| .AWF | Adobe Systems Incorporated | 3D bildfiler | Adobe WorkFlow Workgroup Plugin | Adobe Creative Cloud | Adobe Systems Incorporated |
| .B3D | Blitz Research | 3D bildfiler | Blitz3D Entity Model File | Irrlicht | Open Source |
| .BAF | BioWare | 3D bildfiler | BioWare Infinity Game Engine Script | Baldur's Gate | BioWare |
| .BAR | BlackBerry | 3D bildfiler | BlackBerry OS 10 Application Installation Package | Blackberry 10 | BlackBerry |
| .BDF | Willowsoft Creek Software | 3D bildfiler | Backup Definition File | Backup Made Simple | Willowsoft Creek Software |
| .BIO | IBM | 3D bildfiler | BIOS File | Intel Integrator Toolkit | Intel Corporation |
| .BIP | Unknown Developer | 3D bildfiler | Character Studio Biped File | Character Studio | Autodesk, Inc. |
| .BKG | Samsung Electronics | 3D bildfiler | Samsung Document | Unknown Software | Unknown Developer |
| .BLD | Cadsoft | 3D bildfiler | Envisioneer Building Project File | Cadsoft Envisioneer | Cadsoft |
| .BLEND | Blender Foundation | 3D bildfiler | Blender 3D Data File | Blender | Blender Foundation |
| .BR3 | DAZ 3D | 3D bildfiler | Bryce 3 Scene File | DAZ 3D Bryce | DAZ 3D |
| .BR4 | DAZ 3D | 3D bildfiler | Bryce 4 Scene File | DAZ 3D Bryce | DAZ 3D |
| .BR5 | DAZ 3D | 3D bildfiler | Bryce 5 Scene File | DAZ 3D Bryce | DAZ 3D |
| .BR6 | DAZ 3D | 3D bildfiler | Bryce 6 Scene File | DAZ 3D Bryce | DAZ 3D |
| .BRO | Onyx Computing | 3D bildfiler | Broadleaf Tree Model | OnyxTREE BROADLEAF | Onyx Computing |
| .BRP | Onyx Computing | 3D bildfiler | Tree Professional Broadleaf Creator Image | OnyxTREE BROADLEAF | Onyx Computing |
| .BS1 | VirtualBus.info | 3D bildfiler | VirtualBus Vehicle Configuration File | VirtualBus | Open Source |
| .BSK | DAZ Productions (Daz 3D) | 3D bildfiler | Bryce Sky File | Nero Multimedia Suite | Nero AG |
| .BTO | DAZ 3D | 3D bildfiler | Bryce Tree File | DAZ 3D Bryce | DAZ 3D |
| .C1 | The POV-Team | 3D bildfiler | Pov-Ray For Windows 3.x Scenes Advanced Newltpot File | Pov-Ray | The POV-Team |
| .C4D | MAXON Computer | 3D bildfiler | Cinema 4D Model File | MAXON Cinema 4D | MAXON Computer |
| .CAF | Apple | 3D bildfiler | Apple Core Audio File | Apple QuickTime Player | Apple |
| .CAG | Microsoft Corporation | 3D bildfiler | ClipArt Gallery Package | Microsoft PowerPoint | Microsoft Corporation |
| .CAL | Newera Software Technology, Inc. | 3D bildfiler | CALS Raster File | Adobe Photoshop | Adobe Systems Incorporated |
| .CAS | Autodesk, Inc. | 3D bildfiler | Autodesk Cascade License File | AutoCAD Architecture | Autodesk, Inc. |
| .CBZ | Open Source | 3D bildfiler | Comic Book Zip Archive File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CCB | Ambiera | 3D bildfiler | CopperCube Scene File | CopperCube | Ambiera |
| .CCP | Ambiera | 3D bildfiler | CopperCube JavaScript File | CopperCube | Ambiera |
| .CDB | Nokia | 3D bildfiler | Symbian Phonebook Database | Nokia PC Suite | Nokia |
| .CG | NVIDIA | 3D bildfiler | Cg Program | FX Composer | NVIDIA |
| .CG3 | CABRILOG | 3D bildfiler | Cabri 3D Document | Cabri 3D | CABRILOG |
| .CHO | Hash | 3D bildfiler | Animation:Master Choreography File | Animation:Master | Hash |
| .CHR | Crytek | 3D bildfiler | CryENGINE Character File | CRYENGINE | Crytek |
| .CLT | Clarity Legal | 3D bildfiler | Clarity Legal Transcript File | Clarity Legal Viewer | Clarity Legal |
| .CM2 | Smith Micro Software | 3D bildfiler | Poser Camera Set File | Smith Micro Poser | Smith Micro Software |
| .CMF | Creative Technology Ltd. | 3D bildfiler | Creative Music Format | Nullsoft Winamp | Nullsoft |
| .CMP | Microsoft Corporation | 3D bildfiler | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CORE | Unknown Developer | 3D bildfiler | Core Bitmap Image File | Unknown Software | Unknown Developer |
| .CORRECTION | Fanix Software | 3D bildfiler | Correction File | As-U-Type | Fanix Software |
| .CPD | Adobe Systems Incorporated | 3D bildfiler | RoboHelp Cache Project Database | Adobe RoboHelp | Adobe Systems Incorporated |
| .CPY | Autodesk, Inc. | 3D bildfiler | 3ds Max Copy Track File | Autodesk 3ds Max | Autodesk, Inc. |
| .CR2 | Canon Inc. | 3D bildfiler | Canon Digital Camera Raw Image File | CodedColor PhotoStudio | 1Stein |
| .CRF | Open Source | 3D bildfiler | Cal3D Binary Materials File | Cal3DViewer | Open Source |
| .CRZ | Smith Micro Software | 3D bildfiler | Compressed Poser Character Rigging File | Smith Micro Poser | Smith Micro Software |
| .CSD | Valve | 3D bildfiler | Steam Game Data Backup File | Steam | Valve |
| .CSF | Intergraph Corporation | 3D bildfiler | GeoMedia Coordinate System File | Intergraph GeoMedia | Hexagon Geospatial |
| .CSM | Autodesk, Inc. | 3D bildfiler | Character Studio Marker File | Character Studio | Autodesk, Inc. |
| .CSO | Microsoft Corporation | 3D bildfiler | Compiled Shader Object File | Microsoft Visual Studio | Microsoft Corporation |
| .CST | Smith Micro Software | 3D bildfiler | Manga Studio Story File | Manga Studio | Smith Micro Software |
| .CU3 | Computerinsel GmbH | 3D bildfiler | Photoline4 Curves Clut File | Photoline | Computerinsel GmbH |
| .CWZ | New Wave Concepts | 3D bildfiler | Circuit Wizard File | Circuit Wizard | New Wave Concepts |
| .CXM | Unknown Developer | 3D bildfiler | QuadColor Color Correction Master Data | Unknown Software | Unknown Developer |
| .D3D | YoYo Games | 3D bildfiler | Game Maker 3D File | GameMaker Studio | YoYo Games |
| .DAE | Sony | 3D bildfiler | Digital Asset Exchange File | Autodesk Maya | Autodesk, Inc. |
| .DAT | Unknown Developer | 3D bildfiler | Game Data | Dragon UnPACKer | Open Source |
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