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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .PWI | Microsoft Corporation | CAD Files | Pocket Word Document | Apache OpenOffice | Apache Software Foundation |
| .PWT | Autodesk, Inc. | CAD Files | AutoCAD Publish To Web Template | Autodesk AutoCAD | Autodesk, Inc. |
| .PZD | CAD Zone, Inc | CAD Files | Pocket Zone Drawing | Pocket Zone | CAD Zone, Inc |
| .RCD | Symantec Corporation | CAD Files | PcAnywhere Recorded Session File | pcAnywhere | Symantec Corporation |
| .RDF | Unknown Developer | CAD Files | Resource Description Framework File | Mozilla Firefox | Mozilla |
| .RED | Tailor Made Software | CAD Files | CADViewer Redline Markup File | Tailor Made CADViewer | Tailor Made Software |
| .RIG | Iterum, LLC | CAD Files | vRigger Design File | Iterum vRigger | Iterum, LLC |
| .RLC | ESRI | CAD Files | ArcView Image | ArcView | ESRI |
| .RML | Autodesk, Inc. | CAD Files | Redline Markup Language File | Volo View | Autodesk, Inc. |
| .ROC | Andreas Firnau | CAD Files | SpaceCAD Rocket Design | SpaceCAD | Andreas Firnau |
| .RPF | Rockstar Games | CAD Files | Grand Theft Auto Data File | Grand Theft Auto IV | Rockstar Games |
| .RRA | Iterum, LLC | CAD Files | vRigger Rigging Gear File | Iterum vRigger | Iterum, LLC |
| .RSM | RouterSim | CAD Files | RouterSim Network Visualizer File | RouterSim CCNA Network Visualizer | RouterSim |
| .RTD | Autodesk, Inc. | CAD Files | Robot Structural Analysis Design File | Robot Structural Analysis Professional | Autodesk, Inc. |
| .RTE | Autodesk, Inc. | CAD Files | Revit Project Template | AutoCAD Architecture | Autodesk, Inc. |
| .RVD | Softelec | CAD Files | VPHybridCAD Native Drawing | VPHybridCAD | Softelec |
| .RVT | Autodesk, Inc. | CAD Files | Revit Project File | AutoCAD Architecture | Autodesk, Inc. |
| .RXL | Seetrax CAE Ltd | CAD Files | Seetrax Ranger CAD Drawing File | Ranger XL | Seetrax CAE Ltd |
| .SAB | Spatial Corp | CAD Files | ACIS SAB Model File | TurboCAD Pro Platinum | IMSI/Design, LLC |
| .SAT | Spatial Corp | CAD Files | ACIS SAT 3D Model File | Autodesk Fusion 360 | Autodesk, Inc. |
| .SBP | Autodesk, Inc. | CAD Files | Sketchbook Express iCloud Image | SketchBook | Autodesk, Inc. |
| .SCH | Autodesk, Inc. | CAD Files | EAGLE Schematics File | Autodesk EAGLE | Autodesk, Inc. |
| .SDG | Golden Software LLC | CAD Files | Strater Project File | Strater | Golden Software LLC |
| .SDK | Autodesk, Inc. | CAD Files | AutoSketch Drawing | AutoSketch | Autodesk, Inc. |
| .SEW | S & S Computing | CAD Files | Home Embroidery Format | StudioPlus | Designer's Gallery software |
| .SGO | Volkswagen | CAD Files | ECU Update | Engine Control Unit (ECU) | Volkswagen |
| .SHE | CAD Schroer | CAD Files | Medusa 2D CAD File | Medusa | CAD Schroer |
| .SHX | Autodesk, Inc. | CAD Files | AutoCAD Compiled Shape File | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .SKCHR | Open Source | CAD Files | SketchChair Design | SketchChair | Open Source |
| .SKF | Autodesk, Inc. | CAD Files | AutoSketch Drawing | AutoSketch | Autodesk, Inc. |
| .SLC | Open Source | CAD Files | SLiCe Format Data | 3D Lightyear | 3D Systems |
| .SLDASM | Dassault Systèmes | CAD Files | SolidWorks Assembly File | Autodesk Fusion 360 | Autodesk, Inc. |
| .SLDDRW | Dassault Systèmes | CAD Files | SolidWorks Drawing File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .SLDPRT | Dassault Systèmes | CAD Files | SolidWorks CAD Part File | Autodesk Fusion 360 | Autodesk, Inc. |
| .SM3 | DataCAD LLC | CAD Files | DataCAD Symbol File | DataCAD | DataCAD LLC |
| .SOS | 3AM Solutions | CAD Files | Dynamite VSP Swept Object Style File | Dynamite VSP | 3AM Solutions |
| .SPT | Interactive Data Visualization, Inc. | CAD Files | SpeedTree Tree Data File | SpeedTree Architect | Interactive Data Visualization, Inc. |
| .STD | Oracle Corporation | CAD Files | Apache OpenOffice Drawing Template | Apache OpenOffice | Apache Software Foundation |
| .STL | 3D Systems | CAD Files | Stereolithography File | Creo Parametric 3D Modeling Software | PTC |
| .STYXML | Autodesk, Inc. | CAD Files | Inventor Style Library File | Autodesk Inventor | Autodesk, Inc. |
| .SVD | Polytec | CAD Files | Scanning Vibrometer Data File | Polytec PSV Software | Polytec |
| .SXE | ProfiCAD | CAD Files | ProfiCAD Document | ProfiCAD | ProfiCAD |
| .SYM | The Eclipse Foundation | CAD Files | Symbols File | Eclipse CDT | The Eclipse Foundation |
| .SZN | ISD Group | CAD Files | HiCAD 3D CAD Drawing | HiCAD neXt | ISD Group |
| .T3001 | Ing.-Büro Friedrich | CAD Files | TARGET 3001! Circuit Design Project File | TARGET 3001! | Ing.-Büro Friedrich |
| .T4G | TommySoftware | CAD Files | Tommy Software CAD/Draw File | CAD/DRAW | TommySoftware |
| .T4L | TommySoftware | CAD Files | Tommy Software CAD/Draw File | CAD/DRAW | TommySoftware |
| .TAK | K & K Associates | CAD Files | TAK 2000 Thermal Model File | TAK 2000 | K & K Associates |
| .TAP | Various Developers | CAD Files | Commodore 64 Cassette Tape Image | Fuse | Open Source |
| .TBP | Trimble Inc. | CAD Files | Tekla BIMsight Project | Tekla Structures BIM software | Trimble Inc. |
| .TC3 | IMSI/Design, LLC | CAD Files | TurboCAD 2D/3D Mac Drawing | IMSI TurboCAD Deluxe | Redway3d and others |
| .TCM | IMSI/Design, LLC | CAD Files | TurboCAD Mac Drawing | IMSI TurboCAD Deluxe | Redway3d and others |
| .TCT | Adtollo | CAD Files | Topocad File | Topocad | Adtollo |
| .TCW | IMSI/Design, LLC | CAD Files | TurboCAD Drawing File | TurboCAD | IMSI/Design, LLC |
| .TCX | Garmin | CAD Files | Training Center Database File | Garmin Connect | Garmin |
| .TDF | DVD Copy | CAD Files | Title Definition Format File | DVD X Copy | DVD Copy |
| .TEO | TRUMPF | CAD Files | TruTops Tube Production Data | TruTops Tube | TRUMPF |
| .TOP | KTH Royal Institute of Technology | CAD Files | Gromacs Topology File | Gromacs | KTH Royal Institute of Technology |
| .TOPAZ3D | Topaz 3D | CAD Files | Model Data | Topaz3D | Topaz 3D |
| .TRL | Adtollo | CAD Files | Topocad Roadline Data | Topocad | Adtollo |
| .TSC | DesignSoft | CAD Files | TINA Design File | DesignSoft TINA | DesignSoft |
| .TSF | Golden Software LLC | CAD Files | Strater Template File | Strater | Golden Software LLC |
| .ULD | DIAL | CAD Files | Unified Luminaire Data File | DIAL DIALux | DIAL |
| .UNV | SAP | CAD Files | BusinessObjects Universe Data File | SAP BusinessObjects Business Intelligence | SAP |
| .UPF | Bentley Systems | CAD Files | MicroStation User Preferences File | MicroStation | Bentley Systems |
| .UVR | Dassault Systèmes | CAD Files | 3DXML UVR Mesh Data | X3D | Web3D Consortium |
| .V00 | GE Medical Company | CAD Files | Kretz 3D Ultrasound Image | Kretz Software | GE Medical Company |
| .VCI | Softelec | CAD Files | VPHybridCAD Native Drawing | VPHybridCAD | Softelec |
| .VCP | Microsoft Corporation | CAD Files | eMbedded Visual C++ Project File | Microsoft Visual C++ | Microsoft Corporation |
| .VCZ | Schott Systeme GmbH | CAD Files | Pictures By PC Compressed Drawing File | Pictures by PC | Schott Systeme GmbH |
| .VET | Lectra | CAD Files | Lectra Cutter's Must File | Modaris | Lectra |
| .VKB | MecSoft Corporation | CAD Files | RhinoCAM Tool Library File | RhinoCAM | MecSoft Corporation |
| .VSP | Corel | CAD Files | VideoStudio Project File | Corel VideoStudio Pro | Corel |
| .VTF | Valve | CAD Files | Valve Texture File | VTF Explorer | Open Source |
| .VVN | CAST Software | CAD Files | Vivien Drawing Document | Vivien | CAST Software |
| .VWF | Furukawa Information Technology, Inc. | CAD Files | CADvance Drawing | CADVANCE | Furukawa Information Technology, Inc. |
| .VWX | Nemetschek Group | CAD Files | Vectorworks Design File | VectorWorks | Nemetschek Group |
| .WDF | Workshare | CAD Files | Workshare Compare DeltaFile | Workshare Compare | Workshare |
| .WDP | Microsoft Corporation | CAD Files | Windows Media Photo File | Adobe Photoshop | Adobe Systems Incorporated |
| .WUD | CAST Group of Companies Inc. | CAD Files | Cast Soft Wysiwyg User Data | Cast Soft wysiwyg | CAST Software |
| .X3DB | Web3D Consortium | CAD Files | X3D Binary Format | X3D | Web3D Consortium |
| .XAS | Parametric Technology Corporation | CAD Files | PTC Pro/Engineer Assembly File | Pro/ENGINEER | PTC |
| .XGL | Siemens PLM Software | CAD Files | XGL 3D CAD Model | AVEVA PDMS | AVEVA Group plc |
| .XISE | Xilinx, Inc. | CAD Files | Xilinx ISE Project File | ISE Design Suite | Xilinx, Inc. |
| .XLO | Autodesk, Inc. | CAD Files | Autodesk Inventor Export Journal Data | Autodesk Inventor | Autodesk, Inc. |
| .XMT_TXT | Siemens PLM Software | CAD Files | Parasolid CAD Format | Parasolid | Siemens PLM Software |
| .XSP | Open Source | CAD Files | Kodi Smart Playlist File | Kodi | Open Source |
| .XTR | SourceForge | CAD Files | XTrkCad Demo File | XTrackCAD | SourceForge |
| .XVL | Lattice Technology, Inc. | CAD Files | eXtensible Virtual World Description Language File | XVL Player | Lattice Technology, Inc. |
| .X_B | Siemens PLM Software | CAD Files | Parasolid Model (binary) | Parasolid | Siemens PLM Software |
| .X_T | Siemens PLM Software | CAD Files | Parasolid Model Part File | Autodesk Fusion 360 | Autodesk, Inc. |
| .ZOF | Check Point Software Technologies Ltd. | CAD Files | ZoneAlarm Mailsafe Renamed Data | WinZip | Corel |
| .ZVW | Herman Miller | CAD Files | Z-Axis Office Design Software File | Z-Axis Office Design Software | Herman Miller |
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