.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