| .JAS | Open Source | 3D-bestanden | Cheetah3D Model File | Unity Technologies Unity | Unity Technologies |
| .JLS | Freedom Scientific | 3D-bestanden | JAWS Data File | JAWS | Freedom Scientific |
| .JNG | Pierre-Emmanuel Gougelet | 3D-bestanden | JPEG Network Graphic File | ACDSee Photo Manager | ACD Systems |
| .KFI | Unknown Developer | 3D-bestanden | 3D Forgastest Editor Data | 3D Object Converter | Open Source |
| .KFM | Gamebase | 3D-bestanden | Gamebryo 3D Model File | Gamebryo | Gamebase |
| .KMC | Softobe | 3D-bestanden | Kinemac Animation File | Kinemac | Softobe |
| .KSG | Open Source | 3D-bestanden | Kwalitan Segment File | Kwalitan | Open Source |
| .KT3 | Native Instruments | 3D-bestanden | Battery 3 Drum Kit File | Battery 4 | Native Instruments |
| .KZP | Kazoo3D plc | 3D-bestanden | Kazoo3D Picture Image | KazooStudio | Kazoo3D plc |
| .LAK | SUGIMOTO Tomohiko | 3D-bestanden | Kashmir Data | Kashmir 3D | SUGIMOTO Tomohiko |
| .LND | Upperspace | 3D-bestanden | 3D Landscape File | 3D Landscape for Everyone | Upperspace |
| .LP | Autodesk, Inc. | 3D-bestanden | Lightscape Preparation File | AccuTrans 3D | MicroMouse |
| .LPS | DAZ 3D | 3D-bestanden | Bryce Leaf Shape File | DAZ 3D Bryce | DAZ 3D |
| .LSZ | Unknown Developer | 3D-bestanden | Learning Score Zip File | Learning Score | Unknown Developer |
| .LT2 | Smith Micro Software | 3D-bestanden | Poser Light Set File | Smith Micro Poser | Smith Micro Software |
| .LTX | GSC Game World | 3D-bestanden | S.T.A.L.K.E.R. Properties File | GSC Game World S.T.A.L.K.E.R.: Call of Pripyat | GSC Game World |
| .LWO | NewTek | 3D-bestanden | LightWave 3D Object File | Poser | Smith Micro Software |
| .LWS | NewTek | 3D-bestanden | LightWave 3D Scene File | LightWave 3D | NewTek |
| .LXF | The LEGO Group | 3D-bestanden | LEGO Digital Designer Model File | LEGO Digital Designer | The LEGO Group |
| .LXO | Foundry | 3D-bestanden | Foundry Modo 3D Image | Unity Technologies Unity | Unity Technologies |
| .M3 | Blizzard Entertainment Inc. | 3D-bestanden | Blizzard MDX3 Model File | Blizzard StarCraft 2 | Blizzard Entertainment Inc. |
| .M3D | DIAL | 3D-bestanden | DIALux 3D Object File | DIAL DIALux | DIAL |
| .MA | Autodesk, Inc. | 3D-bestanden | Maya Project File | Autodesk Maya | Autodesk, Inc. |
| .MAT | MathWorks | 3D-bestanden | MATLAB MAT-File | The MathWorks MATLAB | MathWorks |
| .MAX | Autodesk, Inc. | 3D-bestanden | 3ds Max Scene File | Autodesk 3ds Max | Autodesk, Inc. |
| .MB | Autodesk, Inc. | 3D-bestanden | Maya Binary Project File | Autodesk Maya | Autodesk, Inc. |
| .MC5 | Smith Micro Software | 3D-bestanden | Poser 5 Material File | Smith Micro Poser | Smith Micro Software |
| .MCX | CNC Software | 3D-bestanden | Mastercam X And X2 File Format | Mastercam | CNC Software |
| .MDL | MathWorks | 3D-bestanden | MathWorks Simulink Model | Simulink | MathWorks |
| .MDX | Disc Soft Ltd. | 3D-bestanden | Extended Media Descriptor File | DAEMON Tools | Disc Soft Ltd. |
| .MEB | Interscape | 3D-bestanden | PRO100 3D Interior Catalog Element | Ecru Software PRO100 | Ecru Software |
| .MENU | id Software | 3D-bestanden | Quake 3 Engine Menu File | Microsoft Notepad | Microsoft Corporation |
| .MFD | Yamaha Corporation | 3D-bestanden | Music Finder Database | MusicFinderView | PSR Tutorial |
| .MGF | Lawrence Livermore National Laboratory | 3D-bestanden | Materials And Geometry Format | mgflib2 | Radiance Community |
| .MHX | Fujitsu Limited | 3D-bestanden | Fujitsu MicroController Firmware | Fujitsu microcontroller devices. | Fujitsu Limited |
| .MIX | Microsoft Corporation | 3D-bestanden | Microsoft Image Exchange File | Microsoft Picture It! | Microsoft Corporation |
| .MOT | NewTek | 3D-bestanden | LightWave Motion File | LightWave 3D | NewTek |
| .MP | Autodesk, Inc. | 3D-bestanden | Maya PLE Project File | Autodesk Maya | Autodesk, Inc. |
| .MPJ | Minitab Inc | 3D-bestanden | Minitab Project File | Minitab | Minitab Inc |
| .MQO | tetraface Inc. | 3D-bestanden | Metasequoia Document | Metasequoia | tetraface Inc. |
| .MS3D | chUmbaLum sOft | 3D-bestanden | MilkShape 3D Model | chUmbaLum sOft MilkShape 3D | chUmbaLum sOft |
| .MSH | Martin Schweiger | 3D-bestanden | Orbiter 3D Mesh File | Orbiter | Martin Schweiger |
| .MST | Corel | 3D-bestanden | Corel Presentations Master Template File | Corel Presentations X8 | Corel |
| .MTD | Musicnotes | 3D-bestanden | Musicnotes Digital Sheet Music File | Musicnotes Player | Musicnotes |
| .MTL | TurboCAD | 3D-bestanden | OBJ Material File | Autodesk Maya | Autodesk, Inc. |
| .MTV | MyMPX.org | 3D-bestanden | MTV Video Format File | ShedWorx Smart Converter | Shedworx |
| .MTX | Yannick Delwiche | 3D-bestanden | MadTracker 2 Extension | MadTracker 2 | Yannick Delwiche |
| .MU | Squad | 3D-bestanden | Kerbal Space Program Mesh File | Squad Kerbal Space Program | Squad |
| .MUD | Autodesk, Inc. | 3D-bestanden | Mudbox 3D Scene File | Autodesk Mudbox 2017 | Autodesk, Inc. |
| .MVL | Samsung Medison | 3D-bestanden | Medison 3D Volume Data | 3D XI PC Viewer | Samsung Medison |
| .MXM | Next Limit Technologies | 3D-bestanden | Maxwell Material File | Maxwell Render | Next Limit Technologies |
| .MXS | Next Limit Technologies | 3D-bestanden | Maxwell Studio Scene File | Maxwell Render | Next Limit Technologies |
| .N2KM | Zsword | 3D-bestanden | Headshape Modding 3D Tool For 3D Studio Max Modding Data | Headshape Modding 3D Tool | Zsword |
| .NBI | Nero AG | 3D-bestanden | Nero BackItUp Information File | Nero Backitup | Nero AG |
| .NDW | Nemetschek Group | 3D-bestanden | Allplan Engineering File | Allplan Engineering | Nemetschek Group |
| .NFF | Autodesk, Inc. | 3D-bestanden | Neutral File Format | DAZ 3D Bryce | DAZ 3D |
| .NIF | Gamebase | 3D-bestanden | Gamebryo Model File | Gamebryo | Gamebase |
| .NM | Vladimir Romanyuk | 3D-bestanden | Space Engine Nebula Model File | Space Engine | Vladimir Romanyuk |
| .NOI | Unknown Developer | 3D-bestanden | Tgif-3.0 File | Unknown Software | Unknown Developer |
| .OBJ | Wavefront Technologies | 3D-bestanden | Wavefront 3D Object File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .OBK | O&O Software | 3D-bestanden | DiskImage Backup File | O&O DiskImage | O&O Software |
| .OBP | DAZ 3D | 3D-bestanden | Bryce Object File | DAZ 3D Bryce | DAZ 3D |
| .OBZ | Smith Micro Software | 3D-bestanden | Compressed 3D Object File | Poser | Smith Micro Software |
| .OCT | Radiance Community | 3D-bestanden | Radiance Octree File | RADIANCE | Open Source |
| .ODT | Oracle Corporation | 3D-bestanden | OpenDocument Text Document | Apache OpenOffice | Apache Software Foundation |
| .OFF | Open Source | 3D-bestanden | Object File Format | MeshLab | Open Source |
| .OGF | GSC Game World | 3D-bestanden | 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-bestanden | Valve Hammer Object Layout File | Valve Hammer Editor | Valve |
| .OLF | Oyez Professional Services | 3D-bestanden | OyezForms Legal Document | OyezForms | Oyez Professional Services |
| .P21 | LKSoft | 3D-bestanden | Express STEP Data Model File | JSDAI for Eclipse | LKSoft |
| .P3D | Markus Pfau | 3D-bestanden | Peak3D 3D Graphics File | Peak3D | Markus Pfau |
| .P5D | Planner 5D | 3D-bestanden | Planner 5D Project | Planner 5D | Planner 5D |
| .PAT | Autodesk, Inc. | 3D-bestanden | AutoCAD Hatch Pattern File | Autodesk AutoCAD | Autodesk, Inc. |
| .PBF | Paragon Software Group | 3D-bestanden | Paragon Backup File | Paragon Backup & Recovery | Paragon Software Group |
| .PBK | Microsoft Corporation | 3D-bestanden | Dial-Up Phone Book File | Microsoft Windows | Microsoft Corporation |
| .PEB | Corel | 3D-bestanden | Corel WordPerfect Program Editor Bottom Overflow File | Corel WordPerfect X8 | Corel |
| .PFP | Smoky City Design, LLC | 3D-bestanden | Panorama Factory Project | The Panorama Factory | Smoky City Design, LLC |
| .PGS | Grasshopper LLC | 3D-bestanden | PageStream Document | PageStream | Grasshopper LLC |
| .PHY | Autodesk, Inc. | 3D-bestanden | 3ds Max Physique File | Autodesk 3ds Max | Autodesk, Inc. |
| .PL4 | Corel | 3D-bestanden | Micrografx Designer Palette | Micrografx Designer 7 | Corel |
| .PLY | MakeMusic, Inc. | 3D-bestanden | Finale Playback File | Finale | MakeMusic, Inc. |
| .PMD | Adobe Systems Incorporated | 3D-bestanden | PageMaker Document | Adobe InDesign | Adobe Systems Incorporated |
| .PMJ | David Harris | 3D-bestanden | Pegasus Mail Configuration File | Pegasus Mail | David Harris |
| .PMX | Yu Higuchi | 3D-bestanden | MikuMikuDance Model File | MikuMikuDance | Yu Higuchi |
| .PNA | PhatNoise (Harman International) | 3D-bestanden | PhatNoise Audio File | PhatNoise Music Manager | PhatNoise (Harman International) |
| .POS | Trimble Inc. | 3D-bestanden | Trimble Position File | GPS Pathfinder Office Software | Trimble Inc. |
| .PP2 | Pingman Tools | 3D-bestanden | PingPlotter Data File | PingPlotter | Pingman Tools |
| .PPL | Open Source | 3D-bestanden | Free Pascal Dynamic Library | Free Pascal | Open Source |
| .PPZ | Smith Micro Software | 3D-bestanden | Compressed Poser Prop File | Smith Micro Poser | Smith Micro Software |
| .PRC | Adobe Systems Incorporated | 3D-bestanden | Product Representation Compact File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .PRJPCB | Altium | 3D-bestanden | Altium Designer Project File | Altium Designer | Altium |
| .PRM | Unknown Developer | 3D-bestanden | Parameter File | GSAS | National Institute of Standards and Technology (NIST) |
| .PRO | Adobe Systems Incorporated | 3D-bestanden | Adobe Proto Design File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .PRV | E-on Software, Inc. | 3D-bestanden | Vue Preview File | E-on Vue | E-on Software, Inc. |
| .PSA | Epic Games | 3D-bestanden | Unreal Engine Skeletal Animation File | Unreal Tournament | Epic Games |
| .PSK | Epic Games | 3D-bestanden | Unreal Engine Skeletal Mesh File | Epic Games Unreal Engine | Epic Games |
| .PVZ | PTC | 3D-bestanden | ProductView Packaged Structure And Drawing | Creo View Lite (ProductView) | PTC |
| .PZ2 | Smith Micro Software | 3D-bestanden | Poser Pose File | Smith Micro Poser | Smith Micro Software |
| .PZ3 | Smith Micro Software | 3D-bestanden | Poser Scene File | Poser | Smith Micro Software |
| .PZZ | Smith Micro Software | 3D-bestanden | Poser Compressed Scene File | Poser | Smith Micro Software |
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