Got a file with an extension not on this list? Send it to us and we will try to identify it.
Help everyone out. If you have a file with an extension not listed here. Tell us about it and we will add it to this list.
| File Extension | CAD System | File Description/Comments |
|---|---|---|
| .3dm | Rhino | Thanks to Adam Peszel |
| .3dxml | 3D XML | Thanks to Adam Peszel |
| .ai | Adobe Illustrator Files | Thanks to Adam Peszel |
| .ALA | EE DESIGNER III | |
| .art or .ART | Gerber RS-274 (D or X) | ASCII data file Thanks to Nick Meeker, Tech Circuits, Inc. |
| .ART | PCB Artwork file | Vutrax PCB Design Suite thanks to John Coneyworth |
| .ART | PCB Wire file | Vutrax PCB Design Suite thanks to John Coneyworth |
| .ASC | OrCAD Capture | Netlist files for PADS PCB tools. Thanks Mac |
| .ASC | PADS | Design database ASCII file |
| .asc | PROTEL PFW Schematic | ASCII File, human readable. |
| .asc | LTSPICE capture file | ASCII File, human readable. Thanks to Mike Lindberg of Philips Electronics |
| .asm | Pro-E assembly file | Graphic file, thanks Phillip A. Miller |
| .asm | I-DEAS NX assembly fille | Seimens/UGS, thanks Mark Landin, TD Williamson, Inc. |
| .asm | Solid Edge Assembly | Thanks to Adam Peszel |
| .asmdot | SolidWorks Assembly Template | Thanks to Adam Peszel |
| .ast | ProductView 3D Viewer Annotation Redline file from PTC | Graphic file, thanks Dwight Eskridge |
| .atr | CAMCAD Attribute File | |
| .bart | BobCAD-CAM BobART surface file | Thanks to Greg Myers of BobCAD-CAM |
| .bbcd | BobCAD-CAM V22 and newer file | Thanks to Greg Myers of BobCAD-CAM |
| .BBN | ALLEGRO-CADENCE | Bare Board net list |
| .bcom | BobCAD-CAM Milling CAM Feature | Thanks to Greg Myers of BobCAD-CAM |
| .bcot | BobCAD-CAM Turning CAM Feature | Thanks to Greg Myers of BobCAD-CAM |
| .BD1 | ORCAD PCB 386 (DOS) | Binary database (Board) Thanks to Mac |
| .bdf | IDF | Thanks to Adam Peszel |
| .bnr | Unicad / Unisoft | |
| .BRD | Eagle Software | PCB board file, See .sch,.lbr, .scr, and .ulp Thanks to Tally ofHarvard Engineering, LLC . CAD Soft bought out by Autodesk |
| .BRD | CADENCE/VALID ALLEGRO | Bare Board net list, Board drawings are .brd |
| .brd | IDF | Thanks to Adam Peszel |
| .BRD | Mentor Board Outline (Boardstation) | Thanks to Mike Comstock, Northrup Grumman Corporation |
| .BRD | OrCAD PCB II | Board file, Thanks to Mac @ EMA Technical Support |
| .BWB | VariCAD 2D/3D CAD Software | Graphics file, Thanks to Bojan Ivancic |
| .bsf | Zuken CR3000 Layout | Placements, Layers, and Symbols. Thanks to Patrick Casey |
| .cad | BobCAD-CAM V21 and older file | Thanks to Greg Myers of BobCAD-CAM |
| .CAD | GenCAD | ASCII File |
| .catalog | CATIA V5 catalog file | Thanks to Dave Baldwin, Idex Solutions |
| .CATDrawing | CATIA V5 Drawing file | Thanks to Dave Baldwin, Idex Solutions |
| .CATfct | CATIA V5 Feature Dictionary file | Thanks to Dave Baldwin, Idex Solutions |
| .CATMaterial | CATIA V5 Material file | Thanks to Dave Baldwin, Idex Solutions |
| .CATNis | CATIA V5 Naming Equivalency file | Thanks to Dave Baldwin, Idex Solutions |
| .CatPart | CATIA V5 part file | Thanks to William Stockton, IDEX Solutions |
| .CatProduct | CATIA V5 product file | Thanks to William Stockton, IDEX Solutions |
| .CATSpecs | CATIA V5 Specifications file | Thanks to Dave Baldwin, Idex Solutions |
| .CATSystem | CATIA V5 Functional System file | Thanks to Dave Baldwin, Idex Solutions |
| .cc | CAMCAD layout File | Router Solutions, Inc. Thanks to Sonic. |
| .cbt | Cerec 3D CAD-CAM File | Archive of many files. Thanks to LCE Wong |
| .ccz | CAMCAD PCB layout File (Zip Compressed) | Mentor Graphics Thanks to Andreas Schaefer, of Fujitsu |
| .ccf | Zuken ASCII file | Board specific technology (layer counts, units, etc). Thanks to Patrick Casey of SWEMCO. |
| .CDI | CADSTAR | |
| .cgr | Catia Graphics | Thanks to Adam Peszel |
| .CII | SCICARDS | |
| .CKD | KEYCREATOR | KEYCREATOR is the next generation of CADKEY Thanks to Luca Cariglia, C.E.O. of Kubotek |
| .ckd | CADKEY Drawing | Thanks to Adam Peszel |
| .CMP | MENTOR | ASCII files |
| .cor | Veribest EIF Layout | Requires a number of files: cel, clr, cor, des, pad, pin, tec, & trn |
| .cvg | 258X (IPC-2581) CAM file | 258X is an XML-based CAM file format specified by IPC-2581 (http://web.ipc.org). It contains complete information for fabrication of high complexity PCBs and may be used for exchanging information between ECAD and CAM systems (including board fabrication, board test, assembly and assembly test). Thanks to Brian F. G. Bidulock |
| .D | Accumark | Thanks to Brandon Kiely, P.Eng |
| .DAT | OrCAD Capture | Netlist files to Cadence Allegro (Capture 9.2.1 and newer). Thanks Mac. |
| .DAT | SCICARDS | |
| .db | Ansys file | Thanks Phillip A. Miller |
| .dbb | Ansys back-up file | Thanks Phillip A. Miller |
| .dc | DeltaCAD file | http://www.dcad.com/ Thanks Dennis Stickley (Woods) |
| .DDB | PROTEL PCB | Native PCB Database File. |
| .DDB | ORCAD386 | Native PCB Database File. Thanks to Plamen Paneleev |
| .DES | Pro/DESKTOP | Thanks to Scott Beatty, Ricardo, Inc. |
| .DFT | Solid Edge Drawing File | Thanks to Ryan Gudorf. |
| .DGN | MicroStaion Drawing File | Bentley's flagship enginneering design platform Thanks to Al Lakomyj |
| .DGN | PCB Schematic file | Vutrax PCB Design Suite thanks to John Coneyworth |
| .dms | DMIS V3 | ANSI CAM |
| .dpf | Barco | Dynamic Plot Format Thanks Nick Meeker |
| .dll | Add-Ins | Thanks to Adam Peszel |
| .drl | Excellon Drill and Route | ASCII File |
| .drw | SolidWorks drawing file | Thanks to Adam Peszel |
| .DRW | Teradyne/Case Vanguard | Drawing file, thanks Howard Fischer |
| .drwdot | SolidWorks Drawing Template | Thanks to Adam Peszel |
| .DSN | OrCAD Capture | Binary Schematic database. Thanks Mac |
| .DSN | SPECCTRA Autorouter design file format | Thanks Morrie Lewin, Analog Devices |
| .DTS | OrCAD Layout | Drill Tape Summary Report. Thanks Tim Ewell, Technical Support Engineer, OrCAD/Cadence Products. |
| .DWB | VeriCAD 2D/3D CAD Software | Graphics File, Thanks to Bojan Ivancic |
| .dwf | Design Web File | DWF - Design Web Format, the industry standard for sharing data-rich design files electronically. Small, fast, and secure, the DWF format preserves the fidelity and integrity of designs. Access complex design data without the originating design application. Thanks to Darren Jenkins. |
| .dwg | CirCad by Holophase Inc. | Drawing File. See .sch and .pcb Thanks to Dick Zimmer. |
| .dwg | Pro-E drawing file | Graphic file, thanks Phillip A. Miller |
| .DWG | Native AutoCAD® file format | Graphic file, thanks to Nick Meeker, Tech Circuits, Inc. |
| .dxf | AutoCAD ASCII Graphics File | Drawing File. Thanks to David Lui. |
| .dxk | OrCAD Schematic File | Binary File Thanks to Svetla Minkova |
| .e2 | Thinkdesign Drawing | Binary File Thanks to John Chlebus |
| .e3 | Thinkdesign Model | Binary File Thanks to John Chlebus |
| .ed | ProductView 3D Viewer Product Structure File from PTC | Binary File Thanks to Dwight Eskridge |
| .eda | InterComm Expert ECAD View & Markup File from PTC (formerly Ohio Design) | Binary File Thanks to Dwight Eskridge |
| .edz | ProductView 3D Viewer Compressed Package 3D/2D File from PTC | Binary File Thanks to Dwight Eskridge |
| .edf | EDIF V200...V400 | ASCII File |
| .egs | HP EGS Archive | |
| .emn | IDF V3.0 Board | Intermediate Data Format (IDF) Verision 3.0 Board file. IDF is an vendor-neutral format for exchanging ECAD and MCAD information between pcb layout systems and mechanical CAD systems. This extension is for the Board file. Thanks to Brian F. G. Bidulock |
| .emp | IDF V3.0 Library | Intermediate Data Format (IDF) Version 3.0 Library file. IDF is a vendor-neutral format for exchanging ECAD and MCAD information between pcb layout systems and mechanical CAD systems. This extension is for the Library file. Thanks to Brian F. G. Bidulock |
| .eprt | eDrawings | Thanks to Adam Peszel |
| .eps | Encapsulated Postscript | Like .ps but contains additional data for making more transportable to different printing environments. Thanks to David Inman |
| .ex | Excellon Drill and Route | ASCII File |
| .FAB | Fabmaster File | Thanks to Jeremy Williamson, Electronic Source Company |
| .feat | CATIA V5 Feature Dictionary Application file | Thanks to Dave Baldwin, IDEX Solutions |
| .FFS | HyperLynx BoardSim Free Form Schematic file for signal integrity | Thanks to Max Pillie, Mentor Graphics Corp. |
| .fmz | FormZ program by AutoDesSys | Thanks to Shane Brown. |
| .fr | Excellon Drill and Route | ASCII File |
| .ftf | FABMASTER FATF | |
| .g | Micromark | Thanks to Brandon Kiely, P.Eng. |
| .gbr | Gerber (RS-274-X) | ASCII File with D Codes, aperture table included. |
| .gbx/.GBX | Gerber (RS-274-X) | ASCII File with D Codes, aperture table included. |
| .gcm | GenCAM (IPC-2511A) | GenCAM is an ASCII CAM file format specified by IPC-2511A (http;//web.ipc.org). It contains complete information for fabrication of now rather simple PCBs. Thanks to Brian F. G. Bidulock |
| .gcx | GenCAM-XML, GenX (IPC-2511B) | GenCAM-XML (or simply GenX) is an XML-based CAM file format specified by IPC-2511B (http://web.ipc.org). It contains complete information for fabrication of medium complexity PCBs. Thanks to Brian F. G. Bidulock |
| .gds | GDSii Data | Conveys integrated circuit layout data. Thanks to David Inman |
| .ger | Gerber (RS-274-X) | ASCII File with D Codes, aperture table included. |
| .GTD | Wise GerbTool | Project File. Thanks Mac. |
| .gwk | GC Cam | Binary Data File |
| .gz | Gzipped File | Compression routine usually used in combination with tar. |
| .hcg | HCG | Thanks to Adam Peszel |
| .hpg | Hewlett Packard Graphic Language/HPGL2 | ASCII graphic files |
| .hpgl | Hewlett Packard Graphic Language/HPGL2 | ASCII graphic files |
| .hsf | HOOPS HSF | Thanks to Adam Peszel |
| .HYP | HyperLynx BoardSim design file for signal integrity | Thanks to Max Pillie, Mentor Graphics Corp. |
| .iam | AutoDesk Inventor assembly line file | Thanks to Rick Becker, TetraTek Products, Inc. |
| .ibd | IDF | Thanks to Adam Peszel Maybe a misprint, could be .idb according to Jack Strandquist |
| .icd | IronCAD File | 2D Drawing File. Thanks to Tom Lehnhaeser, Magnacad Designs Inc. |
| .ics | IronCAD or Inovate 3D Files | Since IronCAD and Inovate are Single Scene Design environments, Parts, Assemblies, Sheetmetal parts, etc., they have the same extentsion. Thanks to Tom Lehnhaeser, Magnacad Designs Inc. |
| .ide | Autodesk Inventor iFeature | Thanks to Ton de Graaf or NedTrain |
| .idf | Intermediate Data Format | A neutral format for exchanging PCA (Printed Circuit Assemblies) information between PCB layout (ECAD) systems and Mechanical CAD sytems Thanks to Yak |
| .idw | AutoDesk Inventor drawing file | Thanks to Rick Becker, TetraTek Products, Inc. |
| .ifc | IFC 2x3 | Thanks to Adam Peszel |
| .igs | Initial Graphics Exchange Specification(IGES) | ASCII File, may contain electrical data |
| .imd | I-DEAS NX TDM Master fille | Seimens/UGS, thanks Mark Landin, TD Williamson, Inc. |
| .imw | Imageware surface rendering file | Binary File Thanks to Bruce Kniebbe, Delphi Saginaw Steering Systems |
| .imx | InterComm Expert Bookmark Redline File from PTC (formerly Ohio Design) | Binary File Thanks to Dwight Eskridge |
| .in | ODB++ | |
| .ipc | IPC 350/356/356A | ASCII File, board database |
| .ipt | Inventor Part File | Thanks to Adam Peszel |
| .idj | Autodesk Inventor Project File | Thanks to Ton de Graaf or NedTrain |
| .IPL | DanskData DDE | Thanks to Howard Fischer |
| .ipn | AutoDesk Inventor presentation file | Thanks to Rick Becker, TetraTek Products, Inc. |
| .ipt | AutoDesk Inventor part file | Thanks to Rick Becker, TetraTek Products, Inc. |
| .jof | SmartCAM Job Operations File | Thanks to Mike Merrifieldat SmartCAM |
| .jpg | JPEG Graphic File | Thanks to Adam Peszel |
| .jsf | SmartCAM Job Operations File | Thanks to Mike Merrifieldat SmartCAM |
| .jt | 3D Visualization fille | Seimens/UGS, thanks Mark Landin, TD Williamson, Inc. |
| .kyn | Veribest EIF Layout | Requires a number of files: cel, clr, cor, des, pad, pin, tec, & trn |
| .LBR | Eagle Software | Eagle library file, See .sch,.lbr, .scr, and .ulp Thanks to Tally ofHarvard Engineering, LLC |
| .lfp | SolidWorks Library Feature Part | Thanks to Adam Peszel |
| .lib | MENTOR placement data used in 3D modeling (Boardstation) | Thanks to Mike Comstock, Northrup Grumman Corporation |
| .LLB | ORCAD Layout | Binary Library Database. Thanks to Mac |
| .mac | Ansys macro file | text file, thanks Phillip A. Miller |
| .MAX | ORCAD Layout | Binary Board Database. Thanks to Mac |
| .MCC and .MCD | Monu-CAD Pro CAD | Binary database |
| .MCM | Cadence IC Package Design File | Same format as an allegro.brd file, but intended for IC packages Thanks to Raymond Anderson, Xilinx, Inc. |
| .mdt | ZUKEN ASCII file | footprints and packages. Thanks to Patrick Casey of SWEMCO |
| .mdf | I-DEAS NX drawing fille | Seimens/UGS, thanks Mark Landin, TD Williamson, Inc. |
| .MDL | Formaris (Lectra) | Thanks to Brandon Kiely, P.Eng. |
| .mf1/mf2 | I-DEAS NX model fille | Seimens/UGS, thanks Mark Landin, TD Williamson, Inc. |
| .MI | CoCreate ME10 file | Binary, Thanks Rob Emery, L3/KDI Precision Products, Inc. |
| .MIN | ORCAD WIN95 | Binary database |
| .MIN | ORCAD Layout | ASCII Database Format Thanks to Mac |
| .MLD | OrCAD PCB 386+ | Library file, Thanks to Mac @ EMA Technical Support |
| .MNL | ORCAD Capture | Netlist file to OrCAD Layout, Thanks to Mac |
| .MOD | OrCAD PCB II | Library file, Thanks to Mac @ EMA Technical Support |
| .model | CATIA Model File | Thanks to MONROEMACH @ aol.com |
| .NC | Accumark | Thanks to Brandon Kiely, P.Eng. |
| .NET | CADNETIX | |
| .NET | OrCAD Capture | Netlist files for most 3rd party PCB Tools. Thanks Mac |
| .NET | MENTOR | old: FABLINK Neutral file, ASCII File Now: Boardstation Netlist. Thanks to Mike Comstock, ngc.com |
| .NET | NTD file (IPC-D-356) | Net Trace Description (NTD) file is an ASCII file format specified by IPC-D-356 that provides net descriptions for traces in a Gerber, DPF or IPC-350 (IEC 61182-1) file for use by flying probe testers. Thanks to Brian F. G. Bidulock |
| .NPT | OrCAD Layout | Unplated Thru-hole Drill Tape Files. Thanks Tim Ewell, Technical Support Engineer, OrCAD/Cadence Products. |
| .neu | "Neutral" file created by Pro/E for CAD exchange. | unknown Thanks to Dan Aurit, Caterpiller Inc. |
| .odb | Mentor odb++ database | Binary File Thanks to Ross Amans of Intel Corporation |
| .ol | ProductView 3D Viewer Part File from PTC | Binary File Thanks to Dwight Eskridge |
| .OLB | OrCAD Capture | Binary Library Database, Thanks Mac. |
| .OPJ | OrCAD Capture | Project File (ASCII), Thanks Mac. |
| .PAD | CADENCE/VALID ALLEGRO | Bare Board net list, Board drawings are .brd |
| .PAF | VISULA (Zuken/Redac) | CADIF OUT |
| .par | Solid Edge Part | Thanks to Adam Peszel |
| .pcb | Accel EDA | |
| .pcb | gEDA/PCB | Schematic File Format Thanks to Stuart Brorson, MKS Instruments |
| .PCB | CALAY | |
| .PCB | CAM 350 | ASCII Data File (per Luud Teeling) |
| .PCB | CirCad by Holophase Inc. Thanks to Dick Zimmer. |
Printed Circuit Board. See .sch and .dwg |
| .PCB | ExpressPCB | Available at www.expresspcb.com Thanks to Carl VanWormer |
| .PCB | Mentor Boardstation RE layout data | Thanks to Mike Comstock, Northrup Grumman Corporation |
| .PCB | PADs PowerPCB | PCB Design File Thanks to Alan Young |
| .PCB | PROTEL Version 2.8 through 4.0 | Thanks to Mac @ EMA Technical Support |
| .PCB | TANGO | |
| .PCB | TraxMaker PC Board File. | Par of the CircuitMaker 2000 Schematic/Cam package Thanks Ron Rossy of KK1l |
| .PCB | VISULA | PCB Layout database Thanks to Roger M. Stoops, CID+ |
| .PDB | Pantheon | Thanks to Shahed Safavi-Bayat, C.I.D. |
| PCAD PDIF Layout | Database interchange format | |
| Portable Document Format, Adobe Systems | binary file, read by a free readily available reader Thanks to Nick Meeker, Tech Circuits, Inc. |
|
| .phd | Zuken Gerber (RS-274-X) | Zuken ASCII File with D Codes, aperture table included. Thanks, C Novak |
| .pho | Gerber (RS-274-X) | ASCII File with D Codes, aperture table included. |
| .PIN | ALLEGRO | |
| .plt | AutoCAD ADI | Graphic file |
| .plt | CASE Plot | Dumb graphics only, like Gerber |
| .plt | Pro/E Drawing Plot File (hpgl) from PTC | Ascii File Thanks to Dwight Eskridge |
| .plx | Formaris (Lectra) | Plain text, thanks to Michael Lietz |
| .pm4 and .pm5 | SmartCAM Shape (Geometry) File | Thanks to Mike Merrifieldat SmartCAM |
| .pmd | I-DEAS NX TDM Project fille | Seimens/UGS, thanks Mark Landin, TD Williamson, Inc. |
| .prn | AutoCAD ADI | Graphic file |
| .PRT | MENTOR Expedition tool | ASCII files |
| .PRT | CADKEY | Graphic file |
| .PRT | Pro-E part files | Graphic file, thanks Phillip A. Miller |
| .PRT | All Unigraphics files | Graphic file, thanks Phillip A. Miller |
| .prt | SolidWorks part file | Thanks to Adam Peszel |
| .prtdot | SolidWorks Part Template | Thanks to Adam Peszel |
| .psd | Adobe Photoshop Files | Thanks to Adam Peszel |
| .psm | Solid Edge Sheet Metal Part | Thanks to Adam Peszel. Sheet Metal identified by Ryan Gudorf. |
| .ps | PostScript Files | Commonly used as precursor to pdf files. Use Ghostview to view Thanks to Nick Meeker, Tech Circuits, Inc. |
| .pwd | UNICAM | |
| .pzo | Pro2CAD | Thanks to Federico Giovannini of Pro2Dev.it, CTO Chief Technical Officer (Development Team) |
| .rar or .RAR | WinRAR Archive file | binary compressed file that may contain one or more files Thanks to Nick Meeker, Tech Circuits, Inc. |
| .raw | LTSPICE plot file | Thanks to Mike Lindberg of Philips Electronics |
| .rep | ASCII file | Contains aperture size and shape associated with a .pho file. Thanks to Nick Meeker, Tech Circuits, Inc. |
| .RTE | CADENCE/VALID ALLEGRO | Bare Board net list, Board drawings are .brd |
| .sat | ACIS CAD Systems File | Thanks to Robert I. Hickey, Robert Bosch LLC. |
| .SCH | CirCAD by Holophase, Inc. | Electronic Schematic. See .pcb and .dwg |
| .SCH | ExpressPCB | Available at www.expresspcb.com Thanks to Carl VanWormer |
| .SCH | Eagle Software | Eagle schematic file, See .brd,.lbr, .scr, and .ulp Thanks to Tally ofHarvard Engineering, LLC |
| .sch | gEDA/gschem | Schematic File Format Thanks to Stuart Brorson, MKS Instruments |
| .SCH | Orcad | Schematic File Thanks to Alan Young |
| .SCH | Orcad SDT (DOS) | Schematic File Thanks to Mac |
| .SCH | PowerLogic | Schematic File Thanks to Alan Young |
| .SCI | CADNETIX | |
| .SCR | Eagle Software | Eagle user file, See .brd,.lbr, .sch, and .ulp Thanks to Tally ofHarvard Engineering, LLC |
| .sf | GDSii Data | Conveys integrated circuit layout data. Thanks to David Inman |
| .sh2 and .sh3 | SmartCAM Shape (Geometry) File | Thanks to Mike Merrifieldat SmartCAM |
| .sldasm | SolidWorks Assembly File | Thanks to H. Flora |
| .slddrw | SolidWorks Drawing File | Thanks to H. Flora |
| .sldftp | SolidWorks Form Tool | Thanks to Adam Peszel |
| .sldprt | SolidWorks Part File | Thanks to H. Flora |
| .spl | Gerber Layout file | Software by ABACOM Ingenieur (German Layout Software) Thanks to M. Swift |
| .STEP | Standard for the Exchange of Product Model Data | Comprehensive ISO Standard (ISO 10303) that describes how to represent and exchange digital production information Thanks to Allan Wicklund of EXCEL TOOL & DIE CO. INC. |
| .st | NURBS Modeler SolidThinking | Thanks to Matthew Perkins |
| .stl | 3D Design software file format for data transfer | Thanks to Dave Thompson, Venture Mfg. Co. |
| .stp | AP203 | Thanks to Adam Peszel |
| .stp | STEP AP214 | Thanks to Adam Peszel |
| .SYM | CADENCE/VALID ALLEGRO | Bare Board net list, Board drawings are .brd |
| .TCW | IMSI TurboCaD Drewing file | www.turbocad.com, Thanks to George Irish, BNT Marine Electroncs. |
| .TAP | OrCAD Layout | Drill Tape File. Thanks Mac. |
| .tar | Tape Archive File | Binary collection of files. |
| .tgz | Compressed Tape Archive File | Binary collection of files. Use gunzip or equivalent to uncompress, then untar the file. |
| .tgz | May be used as ODB++ data file | Binary collection of files. Thanks to Nick Meeker, Tech Circuits, Inc. |
| .tif | TIFF Graphic File | Thanks to Adam Peszel |
| .tl | THEDA Layout | ASCII File |
| .TLN | HyperLynx LineSim cell based schematic file for signal integrity analysis | Thanks to Max Pillie, Mentor Graphics Corp. |
| .TPT | CADNETIX | |
| .TXF | SPEA topCAD, Mentor Integra | Thanks to Howard Fischer |
| .txt | Veribest EIF Layout | Requires a number of files: cel, clr, cor, des, pad, pin, tec, & trn |
| .u3d | Universal 3D | Thanks to Adam Peszel |
| .udf | ZUKEN ASCII file | Netlist. Thanks to Patrick Casey of SWEMCO |
| .ULP | Eagle Software | Eagle system user file, See .brd,.lbr, .sch, and .scr Thanks to Tally ofHarvard Engineering, LLC |
| .vda | VDAFS | Thanks to Adam Peszel |
| .VSS | Mentor CAD File | Thanks to K.N. Lakshmi Pathi, Advanced Electronics Company |
| .WIR | MENTOR Expedition Tool | ASCII files, Thanks to Mike Comstock, ngc.com |
| .WIRE | Autodesk Alias(Design / Surface / Automotive) | Thanks to Matthew Perkins |
| .wrl | VRML | Thanks to Adam Peszel |
| .x_b | Parasolid Binary | Thanks to Adam Peszel |
| .x_t | Parasolid file | Thanks Phillip A. Miller |
| .xaml | Microsoft XAML | Thanks to Adam Peszel |
| .xas | ProE Assembly File | Thanks to Adam Peszel |
| .xmt_bin | Parasolid | Thanks to Adam Peszel |
| .xmt_txt | Parasolid | Thanks to Adam Peszel |
| .xpr | ProE Part File | Thanks to Adam Peszel |
Got a file you do not know what it is? Send it to us and we will identify it.
Help everyone out. If you have a file with an extension not listed here. Tell us about it and we will add it to this list.
Other resources for file extensions are www.file-extensions.org and www.fileinfo.net. They list every posible file extension.