Accepted File Formats FAQ

.3DMLW – 3D Markup Language for Web files
.3DXML – Dassault Systemes graphic representation
.ACP – VA Software Virtual Architecture CAD file
.AMF – Additive Manufacturing File Format
.AR – Ashlar-Vellum Argon 3D Modeling
.ART – ArtCAM model
.ASC – BRL-CAD Geometry File, old ASCII format
.ASM – Solidedge Assembly, Pro/ENGINEER Assembly
.BIM – Data Design System DDS-CAD
.BIN – Data Design System DDS-CAD
.CCC – CopyCAD Curves
.CCM – CopyCAD Model
.CCS – CopyCAD Session
.CAD – CadStd
.CATDrawing – CATIA V5 Drawing document
.CATPart – CATIA V5 Part document
.CATProduct – CATIA V5 Assembly document
.CATProcess – CATIA V5 Manufacturing document
.CGR – CATIA V5 graphic representation file
.CO – Ashlar-Vellum Cobalt parametric drafting and 3D modeling
.DRW – Caddie Early version of Caddie drawing, prior to DWG
.DWG – AutoCAD and Open Design Alliance applications
.DFT – Solidedge Draft
.DGN – MicroStation design file
.DGK – Delcam Geometry
.DMT – Delcam Machining Triangles
.DXF – AutoCAD ASCII Drawing Interchange file format
.DWB – VariCAD drawing file
.DWF – AutoDesk's Web Design Format, similar to PDF files
.EMB – Wilcom ES Designer Embroidery CAD file
.ESW – Agtek format
.EXCELLON – Excellon file
.EXP – Drawing Express file format
.FM – FeatureCAM Part File
.FMZ – FormZ Project file
.G – BRL-CAD Geometry File
.GERBER – Gerber file
.GLM – KernelCAD model
.GRB – T-FLEX CAD File
.GTC – GRAITEC Advance file format
.IAM – Autodesk Inventor Assembly file
.ICD – IronCAD 2D CAD file
.IDW – Autodesk Inventor Drawing file
.IFC – buildingSMART for sharing AEC and FM data
.IGES – Initial Graphics Exchange Specification
.IPN – Autodesk Inventor Presentation file
.IPT – Autodesk Inventor Part file
.JT – Jupiter Tesselation visualization format 
.MCD – Monu-CAD Monument/Headstone Drawing file
.MODEL – CATIA V4 part document
.OCD - Orienteering Computer Aided Design file
.PAR – Solidedge Part
.PIPE – PIPE-FLO Professional Piping system design file
.PLN – ArchiCad project
.PRT – NX / Unigraphics, Pro/ENGINEER Part, CADKEY Part
.PSM – Solidedge Sheet
.PSMODEL – PowerSHAPE Model
.PWI – PowerINSPECT File
.PYT – Pythagoras File
.SKP – SketchUp Model
.RLF – ArtCAM Relief
.RVT – AutoDesk Revit project files
.RFA – AutoDesk Revit family files
.SCDOC – SpaceClaim 3D Part/Assembly
.SLDASM – SolidWorks Assembly drawing
.SLDDRW – SolidWorks 2D drawing
.SLDPRT – SolidWorks 3D part model
.STEP – Standard for the Exchange of Product model data
.STL – Stereo Lithographic data format
.TCT – TurboCAD drawing template
.TCW – TurboCAD for Windows 2D and 3D drawing
.UNV – I-DEAS Integrated Design and Engineering Analysis Software
.VC6 – Ashlar-Vellum Graphite 2D and 3D drafting
.VLM – Ashlar-Vellum Vellum, Vellum 2D, Vellum Draft, Vellum 3D, DrawingBoard
.VS – Ashlar-Vellum Vellum Solids
.XE – Ashlar-Vellum Xenon for Associative 3D Modeling

.AVE – Aquafadas
.DTP – Greenstreet Publisher, GST PressWorks
.INDD – Adobe InDesign
.MCF – FotoInsight Designer
.PMD – Adobe PageMaker
.PPP – Serif PagePlus
.PUB – Microsoft Publisher
.FM – Adobe FrameMaker
.SCD – Scribus
.SLA – Scribus
.ZAVE – Aquafadas

.602 – Text602 document
.ABW – AbiWord document
.ACL – MS Word AutoCorrect List
.AFP – Advanced Function Presentation
.ANS – American National Standards Institute (ANSI) text
.ASC – ASCII text
.AWW – Ability Write
.CCF – Color Chat 1.0
.CSV – ASCII text as comma-separated values, used in spreadsheets and database management systems
.CWK – ClarisWorks / AppleWorks document
.DOC – Microsoft Word document
.DOCX – Office Open XML document
.DOT – Microsoft Word document template
.DOTX – Office Open XML text document template
.EGT – EGT Universal Document
.FDX – Final Draft
.FTM – Fielded Text Meta
.FTX – Fielded Text (Declared)
.HWP – Haansoft (Hancom) Hangul Word Processor document
.HWPML – Haansoft (Hancom) Hangul Word Processor Markup Language document
.LWP – Lotus Word Pro
.INFO – Texinfo
.MCW – Microsoft Word for Macintosh (versions 4.0–5.1)
.NB – Mathematica Notebook
.NBP – Mathematica Player Notebook
.ODM – OpenDocument master document
.ODT – OpenDocument text document
.OMM – OmmWriter text document
.OTT – OpenDocument text document template
.PAGES – Apple Pages document
.PAP – Papyrus word processor document
.PDAX – Portable Document Archive (PDA) document index file
.PDF – Portable Document Format
.QUOX – Question Object File Format for Quobject Designer or Quobject Explorer
.RPT – Crystal Reports
.RTF – Rich Text document
.SDW – StarWriter text document, used in earlier versions of StarOffice
.STW – OpenOffice.org XML text document template (obsolete) 
.SXW – OpenOffice.org XML text document (obsolete)
.TEX – TeX
.TXT – ASCII or Unicode plaintext
.UOF – Uniform Office Format
.UOML – Unique Object Markup Language
.VIA – Revoware VIA Document Project File
.WPD – WordPerfect document
.WPS – Microsoft Works document
.WPT – Microsoft Works document template
.WRD – WordIt! Document
.WRF – ThinkFree Write
.WRI – Microsoft Write document
.XML – eXtensible Markup Language
.XPS – Open XML Paper Specification

.KEY – Apple Keynote Presentation
.KEYNOTE – Apple Keynote Presentation
.NB – Mathematica Slideshow
.NBP – Mathematica Player slideshow
.ODP – OpenDocument Presentation
.OTP – OpenDocument Presentation template
.PEZ - Prezi Desktop Presentation
.POT – Microsoft PowerPoint template
.PPS – Microsoft PowerPoint Show
.PPT – Microsoft PowerPoint Presentation
.PPTX – Office Open XML Presentation
.PRZ – Lotus Freelance Graphics
.SDD – StarOffice's StarImpress
.SHF – ThinkFree Show
.SHOW – Haansoft (Hancom) Presentation software document
.SHW – Corel Presentations slide show creation
.SLP – Logix-4D Manager Show Control Project
.SSPSS – SongShow Plus Slide Show
.STI – OpenOffice.org XML (obsolete) Presentation template
.SXI – OpenOffice.org XML (obsolete) Presentation
.WATCH – Dataton Watchout Presentation

.123 – Lotus 1-2-3
.AB2 – Abykus worksheet
.AB3 – Abykus workbook
.AWS – Ability Spreadsheet
.CLF – ThinkFree Calc
.CELL – Haansoft (Hancom) SpreadSheet software document
.CSV – Comma-Separated Values
.GNUMERIC – Gnumeric spreadsheet, a gziped XML file
.NUMBERS – Apple Numbers Spreadsheet file
.ODS – OpenDocument spreadsheet
.OTS – OpenDocument spreadsheet template
.QPW – Quattro Pro spreadsheet
.SDC – StarOffice StarCalc Spreadsheet
.SLK – SYmbolic LinK
.STC – OpenOffice.org XML spreadsheet template (obsolete)
.SXC – OpenOffice.org XM spreadsheet template (obsolete)
.TAB – tab delimited columns; also TSV
.TSV – tab separated columns; also TAB
.TXT – tab delimited columns
.VC – Visicalc
.WK1 – Lotus 1-2-3 up to version 2.01
.WK3 – Lotus 1-2-3 version 3.0
.WK4 – Lotus 1-2-3 version 4.0
.WKS – Lotus 1-2-3
.WKS – Microsoft Works
.WQ1 – Quattro Pro DOS version
.XLK – Microsoft Excel worksheet backup
.XLS – Microsoft Excel worksheet sheet (97–2003)
.XLSB – Microsoft Excel binary workbook
.XLSM – Microsoft Excel Macro-enabled workbook
.XLSX – Office Open XML worksheet sheet
.XLR – Microsoft Works version 6.0
.XLT – Microsoft Excel worksheet template
.XLTM – Microsoft Excel Macro-enabled worksheet template
.XLW – Microsoft Excel worksheet workspace (version 4.0)

.ASE – Adobe Swatch
.ART – America Online proprietary format
.BMP – Microsoft Windows Bitmap formatted image
.BLP – Blizzard Entertainment proprietary texture format
.CIT – Intergraph is a monochrome bitmap format
.CPT – Corel PHOTO-PAINT image
.CR2 - Canon camera raw format. 
.CUT – Dr. Halo image file
.DDS – DirectX texture file
.DIB – Device-Independent Bitmap graphic
.DJVU – DjVu for scanned documents
.EGT – EGT Universal Document, used in EGT SmartSense to compress PNG files to yet a smaller file
.EXIF – Exchangeable image file format is a specification for the image file format used by digital cameras
.GIF – CompuServe's Graphics Interchange Format
.GPL – GIMP Palette, using a textual representation of color names and RGB values
.GRF - Zebra Technologies proprietary format
.ICB – Truevision TGA (Targa) image
.ICNS – file format use for icons in Mac OS X. Contains bitmap images at multiple resolutions and bitdepths with alpha channel.
.ICO – a file format used for icons in Microsoft Windows. Contains small bitmap images at multiple resolutions and sizes.
.ILBM – InterLeaved BitMap, a subtype of the Interchange File Format (IFF)
.IFF – Interchange File Format
.JFIF – Joint Photographic Experts Group – a lossy image format widely used to display photographic images.
.JNG – a single-frame MNG using JPEG compression and possibly an alpha channel.
.JP2 – JPEG2000
.JPG – Joint Photographic Experts Group – a lossy image format widely used to display photographic images.
.JPEG – Joint Photographic Experts Group – a lossy image format widely used to display photographic images.
.JPS – JPEG Stereo
.LBM – Deluxe Paint image file
.MAX – ScanSoft PaperPort document
.MIFF – ImageMagick's native file format
.MNG – Multiple Network Graphics, the animated version of PNG
.MSP – Microsoft Paint (old), replaced with BMP in Microsoft Windows 3.0
.NITF – A U.S. Government standard commonly used in Intelligence systems
.PBM – Portable bitmap
.PC1 – Degas low resolution, compressed picture file
.PC2 – Degas medium resolution, compressed picture file
.PC3 – Degas high resolution, compressed picture file
.PCF – Pixel Coordination Format
.PCT – Apple Macintosh PICT image
.PCX – ZSoft's PC Paint, a lossless format, popular on DOS systems.
.PDD – Adobe Photoshop Drawing
.PDN – Paint.NET image file
.PGM – Portable graymap
.PI1 – Degas low resolution, uncompressed picture file
.PI2 – Degas medium resolution, uncompressed picture file. Also Portrait Innovations encrypted image format.
.PI3 – Degas high resolution, uncompressed picture file
.PICT – Apple Macintosh PICT image
.PIX – Truevision TGA (Targa) image
.PNG – Portable Network Graphic lossless, for display and edition of graphic images
.PNM – Portable anymap graphic bitmap image
.PNS – PNG stereo image
.PPM – Portable Pixmap image
.PSB – Adobe Photoshop Big image file
.PSD – Adobe Photoshop Drawing
.PSP – Paint Shop Pro image
.PX – Pixel image editor image file
.PXR – Pixar Image Computer image file
.QFX – QuickLink Fax image
.RAW – General term for image data acquired by a digital camera
.RLE – a run-length encoded image
.SCT – Scitex Continuous Tone image file
.SGI – Silicon Graphics Image
.TARGA – Truevision TGA (Targa) image
.TGA – Truevision TGA (Targa) image
.TIF – Tagged Image File Format
.TIFF – Tagged Image File Format
.VDA – Truevision TGA (Targa) image
.VST – Truevision TGA (Targa) image
.VTF – Valve Texture Format
.XBM – X Window System Bitmap
.XCF – GIMP image
.XPM – X Window System Pixmap

.3DV – 3-D wireframe graphics by Oscar Garcia
.AI – Adobe Illustrator Document
.AMF – Additive Manufacturing File Format
.ART – Xara – Drawing (superseded by XAR)
.AWG – Ability Draw
.CGM – Computer Graphics Metafile an ISO Standard
.CDR – CorelDRAW Document
.CMX – CorelDRAW vector image
.DVI – Tex
.DXF – ASCII Drawing Interchange file Format. AutoCAD and other CAD-programs
.E2D – 2D vector graphics used by the editor which is included in JFire
.EMF – Enhanced (Windows) MetaFile, an extension to WMF
.EPS – Encapsulated Postscript
.GZ – PostScript
.ODG – OpenDocument Drawing
.PCL – 2D Graphic Page Control Language (HP)
.PDF – Portable Document Format
.PS – PostScript 
.SNP – Microsoft Access Report Snapshot
.SVG – Scalable Vector Graphics, employs XML
.SXD – OpenOffice.org XML drawing (obsolete)
.V2D – voucher design used by the voucher management included in JFire
.WMF – Windows Meta File
.XAR – Xara – Drawing
.XPS – Microsoft XML file similar to a PDF file
.XSL-FO – Formatting Objects

.123 – Lotus 1-2-3
.3DMLW – 3D Markup Language for Web files
.3DV – 3-D wireframe graphics by Oscar Garcia
.3DXML – Dassault Systemes graphic representation
.602 – Text602 document
.AB2 – Abykus worksheet
.AB3 – Abykus workbook
.ABW – AbiWord document
.ACL – MS Word AutoCorrect List
.ACP – VA Software Virtual Architecture CAD file
.AFP – Advanced Function Presentation
.AI – Adobe Illustrator Document
.AMF – Additive Manufacturing File Format
.AMF – Additive Manufacturing File Format
.ANS – American National Standards Institute (ANSI) text
.AR – Ashlar-Vellum Argon 3D Modeling
.ART – America Online proprietary format
.ART – ArtCAM model
.ART – Xara – Drawing (superseded by XAR)
.ASC – ASCII text
.ASC – BRL-CAD Geometry File, old ASCII format
.ASE – Adobe Swatch
.ASM – Solidedge Assembly, Pro/ENGINEER Assembly
.AVE – Aquafadas
.AWG – Ability Draw
.AWS – Ability Spreadsheet
.AWW – Ability Write
.BIM – Data Design System DDS-CAD
.BIN – Data Design System DDS-CAD
.BLP – Blizzard Entertainment proprietary texture format
.BMP – Microsoft Windows Bitmap formatted image
.CAD – CadStd
.CATDrawing – CATIA V5 Drawing document
.CATPart – CATIA V5 Part document
.CATProcess – CATIA V5 Manufacturing document
.CATProduct – CATIA V5 Assembly document
.CCC – CopyCAD Curves
.CCF – Color Chat 1.0
.CCM – CopyCAD Model
.CCS – CopyCAD Session
.CDR – CorelDRAW Document
.CELL – Haansoft (Hancom) SpreadSheet software document
.CGM – Computer Graphics Metafile an ISO Standard
.CGR – CATIA V5 graphic representation file
.CIT – Intergraph is a monochrome bitmap format
.CLF – ThinkFree Calc
.CMX – CorelDRAW vector image
.CO – Ashlar-Vellum Cobalt parametric drafting and 3D modeling
.CPT – Corel PHOTO-PAINT image
.CR2 - Canon camera raw format. 
.CSV – ASCII text as comma-separated values, used in spreadsheets and database management systems
.CSV – Comma-Separated Values
.CUT – Dr. Halo image file
.CWK – ClarisWorks / AppleWorks document
.DDS – DirectX texture file
.DFT – Solidedge Draft
.DGK – Delcam Geometry
.DGN – MicroStation design file
.DIB – Device-Independent Bitmap graphic
.DJVU – DjVu for scanned documents
.DMT – Delcam Machining Triangles
.DOC – Microsoft Word document
.DOCX – Office Open XML document
.DOT – Microsoft Word document template
.DOTX – Office Open XML text document template
.DRW – Caddie Early version of Caddie drawing, prior to DWG
.DTP – Greenstreet Publisher, GST PressWorks
.DVI – Tex
.DWB – VariCAD drawing file
.DWF – AutoDesk's Web Design Format, similar to PDF files
.DWG – AutoCAD and Open Design Alliance applications
.DXF – ASCII Drawing Interchange file Format. AutoCAD and other CAD-programs
.DXF – AutoCAD ASCII Drawing Interchange file format
.E2D – 2D vector graphics used by the editor which is included in JFire
.EGT – EGT Universal Document
.EGT – EGT Universal Document, used in EGT SmartSense to compress PNG files to yet a smaller file
.EMB – Wilcom ES Designer Embroidery CAD file
.EMF – Enhanced (Windows) MetaFile, an extension to WMF
.EPS – Encapsulated Postscript
.ESW – Agtek format
.EXCELLON – Excellon file
.EXIF – Exchangeable image file format is a specification for the image file format used by digital cameras
.EXP – Drawing Express file format
.FDX – Final Draft
.FM – Adobe FrameMaker
.FM – FeatureCAM Part File
.FMZ – FormZ Project file
.FTM – Fielded Text Meta
.FTX – Fielded Text (Declared)
.G – BRL-CAD Geometry File
.GERBER – Gerber file
.GIF – CompuServe's Graphics Interchange Format
.GLM – KernelCAD model
.GNUMERIC – Gnumeric spreadsheet, a gziped XML file
.GPL – GIMP Palette, using a textual representation of color names and RGB values
.GRB – T-FLEX CAD File
.GRF - Zebra Technologies proprietary format
.GTC – GRAITEC Advance file format
.GZ – PostScript
.HWP – Haansoft (Hancom) Hangul Word Processor document
.HWPML – Haansoft (Hancom) Hangul Word Processor Markup Language document
.IAM – Autodesk Inventor Assembly file
.ICB – Truevision TGA (Targa) image
.ICD – IronCAD 2D CAD file
.ICNS – file format use for icons in Mac OS X. Contains bitmap images at multiple resolutions and bitdepths with alpha channel.
.ICO – a file format used for icons in Microsoft Windows. Contains small bitmap images at multiple resolutions and sizes.
.IDW – Autodesk Inventor Drawing file
.IFC – buildingSMART for sharing AEC and FM data
.IFF – Interchange File Format
.IGES – Initial Graphics Exchange Specification
.ILBM – InterLeaved BitMap, a subtype of the Interchange File Format (IFF)
.INDD – Adobe InDesign
.INFO – Texinfo
.IPN – Autodesk Inventor Presentation file
.IPT – Autodesk Inventor Part file
.JFIF – Joint Photographic Experts Group – a lossy image format widely used to display photographic images.
.JNG – a single-frame MNG using JPEG compression and possibly an alpha channel.
.JP2 – JPEG2000
.JPEG – Joint Photographic Experts Group – a lossy image format widely used to display photographic images.
.JPG – Joint Photographic Experts Group – a lossy image format widely used to display photographic images.
.JPS – JPEG Stereo
.JT – Jupiter Tesselation visualization format 
.KEY – Apple Keynote Presentation
.KEYNOTE – Apple Keynote Presentation
.LBM – Deluxe Paint image file
.LWP – Lotus Word Pro
.MAX – ScanSoft PaperPort document
.MCD – Monu-CAD Monument/Headstone Drawing file
.MCF – FotoInsight Designer
.MCW – Microsoft Word for Macintosh (versions 4.0–5.1)
.MIFF – ImageMagick's native file format
.MNG – Multiple Network Graphics, the animated version of PNG
.MODEL – CATIA V4 part document
.MSP – Microsoft Paint (old), replaced with BMP in Microsoft Windows 3.0
.NB – Mathematica Notebook
.NB – Mathematica Slideshow
.NBP – Mathematica Player Notebook
.NBP – Mathematica Player slideshow
.NITF – A U.S. Government standard commonly used in Intelligence systems
.NUMBERS – Apple Numbers Spreadsheet file
.OCD - Orienteering Computer Aided Design file
.ODG – OpenDocument Drawing
.ODM – OpenDocument master document
.ODP – OpenDocument Presentation
.ODS – OpenDocument spreadsheet
.ODT – OpenDocument text document
.OMM – OmmWriter text document
.OTP – OpenDocument Presentation template
.OTS – OpenDocument spreadsheet template
.OTT – OpenDocument text document template
.PAGES – Apple Pages document
.PAP – Papyrus word processor document
.PAR – Solidedge Part
.PBM – Portable bitmap
.PC1 – Degas low resolution, compressed picture file
.PC2 – Degas medium resolution, compressed picture file
.PC3 – Degas high resolution, compressed picture file
.PCF – Pixel Coordination Format
.PCL – 2D Graphic Page Control Language (HP)
.PCT – Apple Macintosh PICT image
.PCX – ZSoft's PC Paint, a lossless format, popular on DOS systems.
.PDAX – Portable Document Archive (PDA) document index file
.PDD – Adobe Photoshop Drawing
.PDF – Portable Document Format
.PDF – Portable Document Format
.PDN – Paint.NET image file
.PEZ - Prezi Desktop Presentation
.PGM – Portable graymap
.PI1 – Degas low resolution, uncompressed picture file
.PI2 – Degas medium resolution, uncompressed picture file. Also Portrait Innovations encrypted image format.
.PI3 – Degas high resolution, uncompressed picture file
.PICT – Apple Macintosh PICT image
.PIPE – PIPE-FLO Professional Piping system design file
.PIX – Truevision TGA (Targa) image
.PLN – ArchiCad project
.PMD – Adobe PageMaker
.PNG – Portable Network Graphic lossless, for display and edition of graphic images
.PNM – Portable anymap graphic bitmap image
.PNS – PNG stereo image
.POT – Microsoft PowerPoint template
.PPM – Portable Pixmap image
.PPP – Serif PagePlus
.PPS – Microsoft PowerPoint Show
.PPT – Microsoft PowerPoint Presentation
.PPTX – Office Open XML Presentation
.PRT – NX / Unigraphics, Pro/ENGINEER Part, CADKEY Part
.PRZ – Lotus Freelance Graphics
.PS – PostScript 
.PSB – Adobe Photoshop Big image file
.PSD – Adobe Photoshop Drawing
.PSM – Solidedge Sheet
.PSMODEL – PowerSHAPE Model
.PSP – Paint Shop Pro image
.PUB – Microsoft Publisher
.PWI – PowerINSPECT File
.PX – Pixel image editor image file
.PXR – Pixar Image Computer image file
.PYT – Pythagoras File
.QFX – QuickLink Fax image
.QPW – Quattro Pro spreadsheet
.QUOX – Question Object File Format for Quobject Designer or Quobject Explorer
.RAW – General term for image data acquired by a digital camera
.RFA – AutoDesk Revit family files
.RLE – a run-length encoded image
.RLF – ArtCAM Relief
.RPT – Crystal Reports
.RTF – Rich Text document
.RVT – AutoDesk Revit project files
.SCD – Scribus
.SCDOC – SpaceClaim 3D Part/Assembly
.SCT – Scitex Continuous Tone image file
.SDC – StarOffice StarCalc Spreadsheet
.SDD – StarOffice's StarImpress
.SDW – StarWriter text document, used in earlier versions of StarOffice
.SGI – Silicon Graphics Image
.SHF – ThinkFree Show
.SHOW – Haansoft (Hancom) Presentation software document
.SHW – Corel Presentations slide show creation
.SKP – SketchUp Model
.SLA – Scribus
.SLDASM – SolidWorks Assembly drawing
.SLDDRW – SolidWorks 2D drawing
.SLDPRT – SolidWorks 3D part model
.SLK – SYmbolic LinK
.SLP – Logix-4D Manager Show Control Project
.SNP – Microsoft Access Report Snapshot
.SSPSS – SongShow Plus Slide Show
.STC – OpenOffice.org XML spreadsheet template (obsolete)
.STEP – Standard for the Exchange of Product model data
.STI – OpenOffice.org XML (obsolete) Presentation template
.STL – Stereo Lithographic data format
.STW – OpenOffice.org XML text document template (obsolete) 
.SVG – Scalable Vector Graphics, employs XML
.SXC – OpenOffice.org XM spreadsheet template (obsolete)
.SXD – OpenOffice.org XML drawing (obsolete)
.SXI – OpenOffice.org XML (obsolete) Presentation
.SXW – OpenOffice.org XML text document (obsolete)
.TAB – tab delimited columns; also TSV
.TARGA – Truevision TGA (Targa) image
.TCT – TurboCAD drawing template
.TCW – TurboCAD for Windows 2D and 3D drawing
.TEX – TeX
.TGA – Truevision TGA (Targa) image
.TIF – Tagged Image File Format
.TIFF – Tagged Image File Format
.TSV – tab separated columns; also TAB
.TXT – ASCII or Unicode plaintext
.TXT – tab delimited columns
.UNV – I-DEAS Integrated Design and Engineering Analysis Software
.UOF – Uniform Office Format
.UOML – Unique Object Markup Language
.V2D – voucher design used by the voucher management included in JFire
.VC – Visicalc
.VC6 – Ashlar-Vellum Graphite 2D and 3D drafting
.VDA – Truevision TGA (Targa) image
.VIA – Revoware VIA Document Project File
.VLM – Ashlar-Vellum Vellum, Vellum 2D, Vellum Draft, Vellum 3D, DrawingBoard
.VS – Ashlar-Vellum Vellum Solids
.VST – Truevision TGA (Targa) image
.VTF – Valve Texture Format
.WATCH – Dataton Watchout Presentation
.WK1 – Lotus 1-2-3 up to version 2.01
.WK3 – Lotus 1-2-3 version 3.0
.WK4 – Lotus 1-2-3 version 4.0
.WKS – Lotus 1-2-3
.WKS – Microsoft Works
.WMF – Windows Meta File
.WPD – WordPerfect document
.WPS – Microsoft Works document
.WPT – Microsoft Works document template
.WQ1 – Quattro Pro DOS version
.WRD – WordIt! Document
.WRF – ThinkFree Write
.WRI – Microsoft Write document
.XAR – Xara – Drawing
.XBM – X Window System Bitmap
.XCF – GIMP image
.XE – Ashlar-Vellum Xenon for Associative 3D Modeling
.XLK – Microsoft Excel worksheet backup
.XLR – Microsoft Works version 6.0
.XLS – Microsoft Excel worksheet sheet (97–2003)
.XLSB – Microsoft Excel binary workbook
.XLSM – Microsoft Excel Macro-enabled workbook
.XLSX – Office Open XML worksheet sheet
.XLT – Microsoft Excel worksheet template
.XLTM – Microsoft Excel Macro-enabled worksheet template
.XLW – Microsoft Excel worksheet workspace (version 4.0)
.XML – eXtensible Markup Language
.XPM – X Window System Pixmap 
.XPS – Microsoft XML file similar to a PDF file
.XPS – Open XML Paper Specification
.XSL-FO – Formatting Objects
.ZAVE – Aquafadas