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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .DCH | Novarm | CAD Files | DipTrace Schematics File | DipTrace | Novarm |
| .DCZ | BIGAL | CAD Files | DynaCAD CAD Document | DynaCAD | BIGAL |
| .DDP | Embarcadero Technologies | CAD Files | Delphi Diagram Portfolio File | Delphi (IDE) | Embarcadero Technologies |
| .DFT | Breaktru Software | CAD Files | eJuice Me Up Default Settings File | eJuice Me Up | Breaktru Software |
| .DFX | Autodesk, Inc. | CAD Files | Drafix CAD File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DGB | Digitarch | CAD Files | FlashCAD Drawing Database | Digitarch FlashCAD | Digitarch |
| .DGK | Autodesk, Inc. | CAD Files | Delcam 3D Model File | ArtCAM | Autodesk, Inc. |
| .DGN | Bentley Systems | CAD Files | MicroStation Drawing File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .DGR | Bentley Systems | CAD Files | DART Pro 98 File Group Details | MicroStation | Bentley Systems |
| .DLV | Dassault Systèmes | CAD Files | CATIA 4 Export File | CATIA | Dassault Systèmes |
| .DLX | DIAL | CAD Files | DIALux Document | DIAL DIALux | DIAL |
| .DMZ | Dofl Y.H. Yun | CAD Files | DMesh 3D Model File | DMesh | Dofl Y.H. Yun |
| .DRA | Nuance | CAD Files | Dragon NaturallySpeaking Voice | Dragon NaturallySpeaking | Nuance |
| .DRU | Autodesk, Inc. | CAD Files | EAGLE Design Rules File | Autodesk EAGLE | Autodesk, Inc. |
| .DRW | Corel | CAD Files | DESIGNER Drawing | Corel Presentations X8 | Corel |
| .DSG | Simon Howard (Fraggle) | CAD Files | Doom Saved Game | Chocolate Doom | Simon Howard (Fraggle) |
| .DSN | Cadence Design Systems | CAD Files | OrCAD Design File | OrCAD PCB Designer | Cadence Design Systems |
| .DST | Autodesk, Inc. | CAD Files | AutoCAD Sheet Set File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DTN | IQSoft | CAD Files | TunnelCAD Import Or Export File | Tunnel CAD | IQSoft |
| .DVG | GraphicWorks | CAD Files | Graphic Works Vector Graphic | Data Becker | GraphicWorks |
| .DW2 | IMSI/Design, LLC | CAD Files | DesignCAD Drawing | IMSI DesignCAD 3D Max | IMSI/Design, LLC |
| .DWB | Coryphaeus Software | CAD Files | Designer's Workbench File Format | Designer's Workbench | Coryphaeus Software |
| .DWFX | Autodesk, Inc. | CAD Files | Design Web Format XPS File | Navisworks | Autodesk, Inc. |
| .DWG | Autodesk, Inc. | CAD Files | AutoCAD Drawing Database File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DWM | Open Source | CAD Files | Digital Works Circuit Project | Digital Works | Open Source |
| .DWS | Autodesk, Inc. | CAD Files | AutoCAD Drawing Standards File | Autodesk AutoCAD | Autodesk, Inc. |
| .DWT | Adobe Systems Incorporated | CAD Files | Dreamweaver Web Page Template | MacroMates TextMate | MacroMates |
| .DXE | Autodesk, Inc. | CAD Files | AutoCAD Data Extraction Template | Autodesk AutoCAD | Autodesk, Inc. |
| .DXF | Autodesk, Inc. | CAD Files | Drawing Exchange Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DXX | Autodesk, Inc. | CAD Files | AutoCAD Drawing Interchange Attribute File | Autodesk AutoCAD | Autodesk, Inc. |
| .E2 | DPT Corp | CAD Files | Thinkdesign CAD Document | ThinkDesign Suite | DPT Corp |
| .E3 | DPT Corp | CAD Files | Think3 Thinkdesign CAD Document | ThinkDesign Suite | DPT Corp |
| .E3P | Zuken | CAD Files | E3.series Mechanical Part | E3.series | Zuken |
| .E3S | Zuken | CAD Files | E3.series Project | E3.series | Zuken |
| .EASM | Dassault Systèmes | CAD Files | eDrawings Assembly File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .ECA | Unknown Developer | CAD Files | ElectroCAD File | Unknown Software | Unknown Developer |
| .ED | ANDOR Co, Ltd | CAD Files | EasyDraw CAD File | EasyDraw | ANDOR Co, Ltd |
| .EDF | ESRF | CAD Files | ESRF Data File | SAXS Program Package | ESRF |
| .EDN | Xilinx, Inc. | CAD Files | EDIF Implementation Netlist File | Xilinx ISE WebPACK | Xilinx, Inc. |
| .EDRW | Dassault Systèmes | CAD Files | SolidWorks eDrawings File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .EDRWX | Dassault Systèmes | CAD Files | SolidWorks eDrawings XPS Drawing Document File | SOLIDWORKS | Dassault Systèmes |
| .ELD | DIAL | CAD Files | Eulumdat Formatted Luminaire Data File | DIAL DIALux | DIAL |
| .EMN | PTC | CAD Files | Pro/ENGINEER ECAD IDF File | Creo Parametric 3D Modeling Software | PTC |
| .EMV | National Instruments | CAD Files | LabVIEW Configuration File | LabVIEW | National Instruments |
| .ENR | EnRoute Software | CAD Files | EnRoute V2 Toolpath Data | EnRoute | EnRoute Software |
| .EPF | Vero Software | CAD Files | Edgecam Educational Part File | Planit Edgecam | Vero Software |
| .EPRT | Dassault Systèmes | CAD Files | eDrawings File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .EPX | Informatix Inc. | CAD Files | Piranesi 3D Model File | Piranesi | Informatix Inc. |
| .EQN | Altium | CAD Files | GAL Equation File | Altium Designer | Altium |
| .EQX | Gabor Nagy | CAD Files | EQUINOX Project File | EQUINOX | Gabor Nagy |
| .ESJ | Thermwood Corporation | CAD Files | eCabinet CAD File | eCabinet Systems | Thermwood Corporation |
| .EST | Microsoft Corporation | CAD Files | Streets & Trips Map File | Microsoft MapPoint | Microsoft Corporation |
| .ETZ | Bentley Systems | CAD Files | RAM Elements Model | RAM Elements | Bentley Systems |
| .EWB | National Instruments | CAD Files | Electronics Workbench Circuit Design File | NI Multisim | National Instruments |
| .EWD | DDX Group | CAD Files | EasyWOOD Design File | EasyWOOD | DDX Group |
| .EXB | CAXA | CAD Files | CAXA Draft | IronCAD | IronCAD, LLC |
| .EXP | Unknown Developer | CAD Files | Symbols Export File | Microsoft Visual Studio | Microsoft Corporation |
| .EXPORT | Dassault Systèmes | CAD Files | CATIA Export Data | CATIA | Dassault Systèmes |
| .EZC | Autodesk, Inc. | CAD Files | AutoCAD Ecscad Components Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .EZP | Autodesk, Inc. | CAD Files | AutoCAD Ecscad Project Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .FAN | AutoDesSys, Inc. | CAD Files | Form•Z Animation File | AutoDesSys formZ | AutoDesSys, Inc. |
| .FCD | Smart Projects | CAD Files | Virtual CD Format | IsoBuster | Smart Projects |
| .FCW | Evolution Computing | CAD Files | FastCAD Windows Drawing | IMSI TurboCAD Deluxe | Redway3d and others |
| .FLX | Autodesk, Inc. | CAD Files | FLIC Animation | Apple QuickTime Player | Apple |
| .FLY | Skyline Software Systems | CAD Files | TerraExplorer Project File | TerraExplorer | Skyline Software Systems |
| .FMZ | AutoDesSys, Inc. | CAD Files | Form•Z Project File | AutoDesSys formZ | AutoDesSys, Inc. |
| .FNC | E-on Software, Inc. | CAD Files | Vue Functions File | E-on Vue | E-on Software, Inc. |
| .FN_ | Unknown Developer | CAD Files | CAD File | Unknown Software | Unknown Developer |
| .FPD | Front Panel Express | CAD Files | Front Panel Designer Project | Front Panel Designer | Front Panel Express |
| .FPP | The Eclipse Foundation | CAD Files | Fortran Source Code | MacroMates TextMate | MacroMates |
| .FT | Vero Software | CAD Files | Edgecam Feature Template | Planit Edgecam | Vero Software |
| .FZ | Interaction Design Lab Potsdam | CAD Files | Fritzing Project File | Fritzing | Open Source |
| .FZB | Casio Computer Co., Ltd. | CAD Files | Casio FZ-1 Bank Dump | Awave Studio | FMJ-Software |
| .FZP | Interaction Design Lab Potsdam | CAD Files | Fritzing Part File | Fritzing | Open Source |
| .G | Open Source | CAD Files | BRL-CAD Geometry File | BRL-CAD | Open Source |
| .G01 | U.S. Army Corps of Engineers | CAD Files | HEC-RAS Geometry File | HEC-RAS | U.S. Army Corps of Engineers |
| .G09 | Atari Corporation | CAD Files | Atari Picture Image File | Recoil | Piotr Fusik |
| .G3D | GOM & Company | CAD Files | GOM 3D File | GOM Inspect | GOM & Company |
| .GBP | Genie | CAD Files | Genie Timeline Backup Index File | Genie Timeline | Genie |
| .GBX | Nadeo | CAD Files | Nadeo Game File | TrackMania | Nadeo |
| .GCD | General CADD Products | CAD Files | Generic CADD Drawing File | General CADD Pro | General CADD Products |
| .GDS | Cadence Design Systems | CAD Files | Graphic Data System File | Juspertor LayoutEditor | Juspertor |
| .GEO | Redway3d and others | CAD Files | VRML Geography File | TurboCAD | IMSI/Design, LLC |
| .GERBER | Numerical Innovations | CAD Files | Printed Circuit Board Photoplotter Data | ACE 3000 | Numerical Innovations |
| .GG | CAD Files | Google Desktop Gadget File | Google Desktop | ||
| .GHX | Scott Davidson | CAD Files | Grasshopper File | Grasshopper | Scott Davidson |
| .GM1 | New World Computing | CAD Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GPT | Gerber Technology | CAD Files | Gerber Top Pad Master Data | Altium Designer | Altium |
| .GXA | General CADD Products | CAD Files | General CADD Attribute Data | General CADD Pro | General CADD Products |
| .GXC | General CADD Products | CAD Files | General CADD Pro Component | General CADD Pro | General CADD Products |
| .GXD | General CADD Products | CAD Files | General CADD Pro Drawing | General CADD Pro | General CADD Products |
| .GXM | General CADD Products | CAD Files | General CADD Pro Macro File | General CADD Pro | General CADD Products |
| .HCP | HydroCAD Software Solutions | CAD Files | HydroCAD Project File | HydroCAD | HydroCAD Software Solutions |
| .HDC | TCD Labs | CAD Files | HD Tach Benchmark Results | HD Tach | TCD Labs |
| .HDI | Open Source | CAD Files | Hard Disk Image | Anex86 | Open Source |
| .HLN | Bentley Systems | CAD Files | MicroStation Hidden Line Data | MicroStation | Bentley Systems |
| .HRC | Autodesk, Inc. | CAD Files | Softimage 3D Model | Autodesk Softimage 2015 | Autodesk, Inc. |
| .HRZ | Unknown Developer | CAD Files | Slow Scan TeleVision File (SSTV) | XnView MP | XnSoft |
| .HSC | Aspen Technology, Inc. | CAD Files | Aspen HYSYS Simulation File | Aspen HYSYS | Aspen Technology, Inc. |
| .HSF | Tech Soft 3D | CAD Files | HOOPS Stream Format File | CATIA | Dassault Systèmes |
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