| File extension | Developer/Producer | File description |
|---|---|---|
| W file extension | Progress Software | OpenEdge Architect Source Code Format |
| W01 file extension | N/A | Yamaha Dog Audio Sample Format |
| W02 file extension | N/A | Split Archive Format |
| W03 file extension | N/A | Yamaha Pig Audio Sample |
| W04 file extension | N/A | Yamaha Cattle Audio Sample |
| W05 file extension | N/A | Yamaha Horse Audio Sample |
| W06 file extension | N/A | Yamaha Lion Audio Sample |
| W07 file extension | N/A | Yamaha Elephant Audio Sample |
| W08 file extension | N/A | Yamaha Goat Audio Sample |
| W09 file extension | N/A | Yamaha Sea-lion Audio Sample |
| W20 file extension | Microsoft Corporation | Windows 2000 Related |
| W2A file extension | N/A | Yamaha Motif All Format |
| W2D file extension | Autodesk, Inc. | Autodesk Design (Drawing) Web Format 2D |
| W2E file extension | John Melas Software | Motif Rack ES Voice Editor |
| W2M file extension | Gailius Raskinis | Solo Explorer Transcription |
| W2P file extension | X-Volt Studios | Webit |
| W2V file extension | N/A | Yamaha Motif Voices Format |
| W2W file extension | N/A | Yamaha Motif Waveforms Format |
| W30 file extension | Corel Corporation | Ventura Publisher Printer Font |
| W31 file extension | Microsoft Corporation | Windows 3.1 Startup |
| W32 file extension | Sysmedia | WinCAPs Subtitle Format |
| W3D file extension | Adobe Systems | Adobe Shockwave 3D Scene Export Format |
| W3E file extension | John Melas Software | Motif Rack ES Voice Editor |
| W3G file extension | Blizzard Entertainment | Blizzard Warcraft III Game Replay Format |
| W3I file extension | Blizzard Entertainment, Inc. | Warcraft III Map Related |
| W3L file extension | N/A | W3launch |
| W3M file extension | Blizzard Entertainment | Warcraft 3 Map Format |
| W3N file extension | Blizzard Entertainment | Warcraft 3 Frozen Throne Campaign Format |
| W3P file extension | Blizzard Entertainment, Inc. | Warcraft 3 Progress |
| W3U file extension | Blizzard Entertainment, Inc. | Warcraft 3 Custom Units |
| W3V file extension | Blizzard Entertainment, Inc. | Warcraft 3 Campaign Progress Record |
| W3X file extension | Blizzard Entertainment | Blizzard Warcraft III Expansion Map Format |
| W3Z file extension | Blizzard Entertainment | Blizzard Warcraft III Saved Game Format |
| W40 file extension | N/A | Windows 95 Backup Format |
| W44 file extension | dataBased Intelligence, Inc. | DBASE Temporary |
| W4A file extension | N/A | Audio |
| W51 file extension | Corel Corporation | Corel WordPerfect 5.1 Document |
| W5S file extension | Nullsoft, Inc. | Winamp CDDB Database |
| W60 file extension | Corel Corporation | Corel WordPerfect 6.0 Document |
| W61 file extension | Corel Corporation | Corel WordPerfect 6.1 Document |
| W64 file extension | Sony | Sonic Foundry Wave-64 Format |
| W6BN file extension | Microsoft Corporation | Microsoft Word 6 For Mac Document |
| W6E file extension | John Melas Software | Motif Rack ES Voice Editor |
| W6W file extension | Microsoft Corporation | Microsoft Word 6 Document |
| W7A file extension | N/A | Yamaha Motif ES Format |
| W7E file extension | John Melas Software | Motif Rack ES Voice Editor |
| W7V file extension | N/A | Yamaha Motif ES Voices Format |
| W7W file extension | N/A | Yamaha Motif ES Waveforms |
| W8BN file extension | Microsoft Corporation | Microsoft Word 98 For Mac Document |
| W8E file extension | John Melas Software | Motif Rack ES Voice Editor |
| W8TN file extension | Microsoft Corporation | Microsoft Word 98 For Mac Template |
| W8V file extension | N/A | Yamaha Motif ES Sample Data |
| W95 file extension | Microsoft Corporation | Windows 95 Data |
| W98 file extension | Microsoft Corporation | Microsoft Windows 98 Related Data |
| W9E file extension | John Melas Software | Motif Rack ES Voice Editor |
| W?? file extension | N/A | Yamaha SY-series And TX16W Wave |
| WA! file extension | N/A | GigaStudio/GigaSampler Compressed Wave |
| WA0 file extension | MAGIX AG | Magix Music Studio |
| WA2 file extension | Midnight Synergy | Wonderland Adventures Custom Game Format |
| WAB file extension | Microsoft | Microsoft Windows Address Book Format |
| WAC file extension | www.wiscocomputing.com | WISCO Accounts Storage |
| WAD file extension | N/A | Wally Game Texture Archive |
| WAF file extension | N/A | Microsoft Internet Explorer For Mac Cache |
| WAFF file extension | Microsoft Corporation | IE Saved Web Page |
| WAG file extension | Microsoft Corporation | Train Simulator Wagon |
| WAGAME file extension | Team 17 | Worms Armageddon Game Replay |
| WAI file extension | Blizzard Entertainment, Inc. | Warcraft 3 AI Data |
| WAJ file extension | Softomotive Ltd | WinAutomation |
| WAL file extension | N/A | Quake 2 Texture Image Format |
| WAP file extension | N/A | Wireless Bitmap (level 0) Image Format |
| WAR file extension | Oracle | Java Web Archive Format |
| WAT file extension | IBM | IBM Voice Type Languages Map |
| WAV file extension | Microsoft | WAVe PCM Sound, Standard Windows Sound Format |
| WAVE file extension | N/A | WAVe PCM Sound Format |
| WAX file extension | N/A | Windows Media Audio Redirector Format |
| WA~ file extension | N/A | Microsoft Address Book |
| WB file extension | Electronic Arts, Inc. | FIFA 2000 |
| WB0 file extension | Corel Corporation | Corel Quattro Pro Spreadsheet |
| WB1 file extension | AG Interactive | WebShots Image Format |
| WB2 file extension | Corel | Corel Quattro Pro Spreadsheet Format |
| WB3 file extension | Corel | Corel Quattro Pro Spreadsheet Format |
| WB4 file extension | Stardock Corporation | WindowBlinds Default Skin |
| WB? file extension | Corel Corporation | Corel Quattro Pro Spreadsheet |
| WBA file extension | Stardock | WindowBlinds Desktop Visual Style |
| WBB file extension | Uniblue | WinBackup Backup Format |
| WBC file extension | AG Interactive | Webshots Collection Image Format |
| WBCAT file extension | Microsoft | Microsoft Windows Backup Information Format |
| WBD file extension | AG Interactive | Webshots Graphic Format |
| WBDP file extension | ANSYS Inc. | ANSYS Workbench Project Global |
| WBF file extension | Microsoft Corporation | Microsoft Windows Batch |
| WBFS file extension | Waninkoko | Nintendo Wii Backup Format System Format |
| WBK file extension | Microsoft | Microsoft Word Auto-backup Document Format |
| WBM file extension | N/A | Wireless Bitmap Image Format |
| WBMP file extension | N/A | Wireless Bitmap Image Format |
| WBO file extension | The Database Managers, Inc. | DataFlex Web Business Object |
| WBP file extension | AG.com, Inc. | Webshots Image |
| WBPJ file extension | ANSYS Inc. | ANSYS Workbench Project |
| WBPZ file extension | ANSYS Inc. | ANSYS Update Package |
| WBS file extension | MicroVision Development, Inc. | WebExpress Website |
| WBT file extension | Nabi Studios | Toribash Help Format |
| WBU file extension | Samsung Group | Samsung PC Studio Backup |
| WBVERIFY file extension | Microsoft Corporation | Microsoft Windows Backup |
| WBX file extension | AG.com, Inc. | Webshots |
| WBXML file extension | Open Mobile Alliance | WAP Binary XML Format |
| WBZ file extension | AG Interactive | Webshots Image Format |
| WC file extension | Ghisler Software GmbH | Total Commander File Tree Info |
| WCAT file extension | WinCatalog.com | WinCatalog Collection Format |
| WCD file extension | Microsoft | Microsoft Works Calendar Format |
| WCF file extension | N/A | WebEx Saved Chat Session Format |
| WCH file extension | ALT- Advanced Logic Technology | WellCAD Header |
| WCINV-MS-P2P file extension | Microsoft Corporation | Windows Meeting Space |
| WCK file extension | Bentley Systems, Incorporated | WaterCAD |
| WCL file extension | ALT- Advanced Logic Technology | WellCAD Log |
| WCM file extension | Microsoft | Microsoft Works Communications Script Format |
| WCP file extension | Corel | WinDVD Creator Project Format |
| WCPL file extension | MaximumSoft Corp. | Webcopier Project Settings |
| WCST file extension | Telestream | Wirecast Document |
| WCT file extension | Fairlogic Systems | WordCast Project |
| WCX file extension | Microsoft | RemoteApp And Desktop Connections Configuration Format |
| WCXF file extension | N/A | WorldCard Exchange |
| WCZ file extension | Softshape Development | Chameleon Clock Wallpaper Format |
| WD file extension | Jelsoft Enterprises Ltd. | Earth 2140-2160 Game Archive |
| WD0 file extension | MicroVision Development, Inc. | WordExpress Document |
| WD1 file extension | MicroVision Development, Inc. | WordExpress Document |
| WD2 file extension | Micro Logic Corp. | Info Select Database |
| WD3 file extension | MetaProducts Systems | Offline Explorer Directory Index Format |
| WDB file extension | Microsoft | Microsoft Works Database Format |
| WDBN file extension | Microsoft Corporation | Microsoft World For Mac Document |
| WDCD file extension | Microsoft Corporation | Word 5 For Mac Custom Dictionary |
| WDD file extension | Autodesk, Inc. | AutoCAD Electrical Description List |
| WDF file extension | Workshare | Microsoft Windows Driver Foundation Format |
| WDGP file extension | Microsoft Corporation | Word For Mac Add-in |
| WDGT file extension | Apple | Apple Mac OS X Dashboard Widget |
| WDGTPROJ file extension | Apple | Dashcode Widget Project |
| WDI file extension | PC SOFT | WINDEV Component Description |
| WDIC file extension | Microsoft Corporation | Word 5 For Mac Extension |
| WDK file extension | PC SOFT | WINDEV Component |
| WDL file extension | Conitec Datasystems | World Definition Language Script |
| WDLL file extension | Microsoft Corporation | Word 6 For Mac Add-in |
| WDM file extension | N/A | BASINS Meteorological Database |
| WDN file extension | Autodesk, Inc. | AutoCAD Electrical Project-related |
| WDOC file extension | Crick Software Ltd. | WriteOnline Document |
| WDP file extension | Microsoft | Windows Media HD Photo |
| WDPROJ file extension | Microsoft Corporation | Microsoft Visual Studio Web Deployment Project |
| WDQ file extension | MetaProducts | WDQ Offline Explorer Queue Format |
| WDR file extension | LucasArts Entertainment Company, LLC | Star Wars: Tie Fighter Media |
| WDSEML file extension | Mozilla | Mozilla Thunderbird Mail Message Format |
| WDT file extension | SYNAMETIRCS | WinSQL Schema Diff Template |
| WDV file extension | Systems, Software, Technology Incorporated | TracePlus Web Detective |
| WDW file extension | PC SOFT | WINDEV Window Format |
| WDX file extension | Ghisler Software GmbH | Total Commander Content Plugin |
| WDX9 file extension | Microsoft Corporation | Microsoft Word For Mac Wizard |
| WDY file extension | PC SOFT | WINDEV Run-time Template |
| WE file extension | Electronic Arts, Inc. | Fifa2000 Be Game |
| WE? file extension | N/A | Standard Mail Archive |
| WEA file extension | Autodesk | Ecotect Weather Format |
| WEAP file extension | id Software | Quake 3 Id Tech 3 Game Engine Weapon Format |
| WEB file extension | MAGIX | Xara Web Document Format |
| WEBALLOWBLOCKLIST file extension | Microsoft Corporation | Windows Vista Parental Control Settings |
| WEBARCHIVE file extension | Apple | Apple Safari Web Archive Format |
| WEBARCHIVEXML file extension | Android 3.1 Browser Saved Website Format | |
| WEBBOOKMARK file extension | Apple | Apple Safari Bookmark Format |
| WEBDOC file extension | Box.net | Box Service Document Format |
| WEBHISTORY file extension | Apple | Apple Safari History Item Format |
| WEBINAR file extension | Citrix Systems, Inc. | GoToWebinar Session |
| WEBINFO file extension | Microsoft Corporation | Visual Studio .NET |
| WEBINTENTS file extension | N/A | Webintents |
| WEBLOC file extension | Apple | Apple Mac OS X Finder Internet URL |
| WEBM file extension | Matroska WebM Video Format | |
| WEBOOGL file extension | The Geometry Center | Web Object Oriented Graphics Library |
| WEBP file extension | WebP Image | |
| WEBPART file extension | Microsoft Corporation | Microsoft SharePoint Web Part |
| WEBPNP file extension | Microsoft | Web Point And Print Format |
| WEBPUBLISHHISTORY file extension | Alpha Software, Inc. | Alpha Five |
| WEBSETTINGS file extension | N/A | JEE2 Web Project Settings |
| WEBSITE file extension | Microsoft | Internet Explorer 9 Pinned Site Shortcut Format |
| WEBTEMPLATE file extension | Apple | Apple IWeb Template Format |
| WEBTEST file extension | Microsoft Corporation | Microsoft Visual Studio Web Test |
| WEBTESTRESULT file extension | Microsoft Corporation | Microsoft Visual Studio Web Test Result |
| WEBTHEME file extension | Apple | Apple IWeb Theme Format |
| WEBZ file extension | Web Books Publishing | Web Format Compressed EBook Format |
| WED file extension | Mozilla Corporation | Firefox Bookmark Backup |
| WEF file extension | Microsoft Corporation | Exchange File System Format |
| WEIGHTOUTPUT file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Sequence |
| WEIGHTS file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Sequence Weights |
| WEM file extension | Audiokinetic | Wwise Encoded Media Audio Format |
| WEP file extension | WebWorks | EPublisher Stationery Design Project |
| WER file extension | Microsoft | Microsoft Windows Application Error Report |
| WET file extension | SYNAMETIRCS | WinSQL Export Template |
| WF file extension | Electronic Arts, Inc. | FIFA 2000 Play |
| WF1 file extension | Quantitative Micro Software | EViews Work |
| WF4 file extension | Parametric Technology Corporation | Creo Parametric Symbol |
| WFB file extension | N/A | Turtle Beach WaveFront Bank Format |
| WFC file extension | Microsoft | Windows Wireless Network Settings Format |
| WFD file extension | N/A | Turtle Beach WaveFront Drum Set Format |
| WFF file extension | ixellence GmbH | Dataplore Wavelet Filter |
| WFK file extension | Embarcadero Technologies, Inc. | Delphi |
| WFL file extension | Ultimus | Offline Design For Workflow Process |
| WFLOW file extension | Apple, Inc. | Apple Mac OS X Automator Workflow |
| WFM file extension | dataBased Intelligence | DBASE Form Format |
| WFO file extension | Embarcadero Technologies, Inc. | Delphi Runimage |
| WFP file extension | N/A | Turtle Beach WaveFront Audio Format |
| WFS file extension | Microsoft Corporation | Microsoft Windows Installation Script |
| WFT file extension | Rockstar Games | GTA 4 Car Model Format |
| WFV file extension | Click&DECiDE | DataSet Vision Query Report |
| WFW file extension | Microsoft Corporation | Windows Firewall Policy Export |
| WFX file extension | Symantec Corporation | WinFax |
| WG file extension | Electronic Arts, Inc. | Fifa 2000 Game |
| WG1 file extension | IBM | Lotus 1-2-3 Worksheet |
| WG2 file extension | IBM | Lotus 1-2-3 For OS/2 Worksheet |
| WGAMEPROFILE file extension | Activision | X-Men Origins: Wolverine Profile |
| WGF file extension | The Widelands Development Team | Widelands Game Format |
| WGN file extension | Grassland, Soil & Water Research Laboratory | SWAT Wather Generator Input |
| WGOM file extension | CompeGPS TEAM S.L. | CompeGPS Land Google Earth Remote Map |
| WGP file extension | WebHat | Web Gallery Project Format |
| WGS file extension | ChannelAdvisor | Walk-Graph Segment |
| WGT file extension | Opera Software | Opera Widgets Format |
| WGZ file extension | Nokia | S60 Web Runtime Widget Package Format |
| WHB file extension | WindSolutions | Apple IPod Backup Image |
| WHD file extension | Xport | WinUAEX Amiga Game ROM |
| WHIRLD file extension | Aubrey Falconer | Unity Whirld Format |
| WHLP file extension | Microsoft Corporation | Microsoft Word For Mac Help |
| WHM file extension | Relic Entertainment Inc. | Warhammer 40,000: Dawn Of War Model |
| WHT file extension | Microsoft Corporation | Microsoft NetMeeting White Board Document |
| WHTT file extension | Xavier Roche | WinHTTrack Project |
| WI file extension | N/A | Wavelet Compressed Image Format |
| WIA file extension | N/A | Nintendo Wii ISO Archive |
| WIC file extension | N/A | J Wavelet Image Codec Image Format |
| WICSAVEGAME file extension | Massive Entertainment AB | World In Conflict Saved Game |
| WID file extension | SAP | SAP BusinessObjects Web Intelligence Format |
| WIDGET file extension | Yahoo! | Yahoo! Widget Format |
| WIF file extension | N/A | Weaving Information Format |
| WIFF file extension | AB SCIEX | AB SCIEX Windows Interchange File Format |
| WII file extension | N/A | Nintendo WII Raw Disk Image Format |
| WIKI file extension | N/A | Wiki Markup Source |
| WIL file extension | Gilles Vollant | WinImage Data Format |
| WIM file extension | Microsoft | Windows Imaging Format Archive Format |
| WIMP file extension | Microsoft Corporation | Microsoft Windows Icon Palette |
| WIN file extension | Microsoft | Windows Backup Format |
| WIN32MANIFEST file extension | Microsoft Corporation | Microsoft Win32 Manifest |
| WINCE file extension | Microsoft Corporation | Microsoft Windows CE Program Executable |
| WINCLONE file extension | Twocanoes Software | Winclone Disk Image Format |
| WINDOWSLIVECONTACT file extension | Microsoft | Microsoft Live Messenger Format |
| WINDOWSLIVEGROUP file extension | Microsoft Corporation | Windows Live Mail |
| WINMD file extension | N/A | Windows Runtime Metadata Output |
| WIP file extension | CyberScrub LLC. | CyberScrub Privacy Suite Wipe |
| WIPEINFO file extension | Symantec Corporation | Norton Utilities Sendto |
| WIPESLACK file extension | Symantec Corporation | Norton Utilities Sendto |
| WIQ file extension | Microsoft | Microsoft Visual Studio Format |
| WIRE file extension | N/A | Wavefront Studio Wireframe |
| WIS file extension | Flexera Software, Inc. | InstallShield Install Help |
| WIT file extension | Christophe Guibert | WebIdeaTree Project |
| WIX file extension | Xara Group Limited. | Xara Internal Graphics Data |
| WIXLIB file extension | Microsoft Corporation | WiX Library |
| WIXMSP file extension | Microsoft Corporation | WiX XML Patch |
| WIXMST file extension | Microsoft Corporation | WiX Transform |
| WIXOBJ file extension | Microsoft Corporation | WiX Object |
| WIXOUT file extension | Microsoft Corporation | WiX XML Output |
| WIXPDB file extension | Microsoft Corporation | WiX Debug |
| WIXPROJ file extension | Microsoft Corporation | WiX Windows Installer XML Project |
| WIZ file extension | Microsoft | Microsoft Office Wizard Format |
| WIZHTML file extension | Microsoft Corporation | Microsoft Access HTML Template |
| WJ file extension | Electronic Arts, Inc. | Fifa 2000 Game |
| WJE file extension | Mariner Software | WinJournal Entry Format |
| WJF file extension | Corel | WinZip Job Format |
| WJR file extension | ReGet | ReGet Deluxe Data Format |
| WK! file extension | IBM | Lotus 1-2-3 Spreadsheet |
| WK1 file extension | IBM | Lotus 1-2-3 Version 2.x Spreadsheet Format |
| WK2 file extension | IBM | Lotus 1-2-3 Version 2 Spreadsheet Format |
| WK3 file extension | IBM | Lotus 1-2-3 Version 3.x Spreadsheet Format |
| WK4 file extension | IBM | Lotus 1-2-3 Version 4.x Spreadsheet Format |
| WK5 file extension | IBM | Lotus 1-2-3 Version 5 Spreadsheet Format |
| WKB file extension | Corel Corporation | Corel WordPerfect Document |
| WKE file extension | IBM | Lotus 1-2-3 Educational Version Spreadsheet Format |
| WKF file extension | KeyFocus Ltd. | KF Web Server Default Control |
| WKI file extension | N/A | Lotus 1-2-3 Version 2 Spreadsheet Format |
| WKP file extension | Web CEO Ltd. | Web CEO Database Backup |
| WKQ file extension | Corel Corporation | Corel Quattro Pro For MS-DOS Spreadsheet |
| WKS file extension | Microsoft | Microsoft Works Spreadsheet Document Format |
| WKT file extension | Garmin Ltd. | Garmin Training Schedule |
| WKU file extension | N/A | Lotus 1-2-3 Spreadsheet Format |
| WKZ file extension | Informix | Wingz Spreadsheet |
| WL file extension | www.wiscocomputing.com | WISCO Word Power Word Lists And Definitions |
| WL1 file extension | id Software | Wolfenstein 3D Shareware Version Format |
| WL3 file extension | id Software LLC | Wolfenstein 3D Registered Version |
| WL6 file extension | id Software | Wolfenstein 3D Registered Version Format |
| WLC file extension | Microsoft Corporation | Microsoft Live Mesh |
| WLD file extension | ESRI | ArcView CAD Datasets World Format |
| WLF file extension | Microsoft Corporation | Microsoft Windows Dr. Watson Log |
| WLG file extension | Porpoise Media | Well Logger V1 |
| WLK file extension | Davis Instruments, Corp | Weatherlink Data |
| WLL file extension | Microsoft | Microsoft Word Add-in Format |
| WLM file extension | N/A | CompW Image Format |
| WLMP file extension | Microsoft | Microsoft Windows Live Movie Maker Video Project Format |
| WLP file extension | Worldlabel.com | Worldlabel.com Label Designer Format |
| WLS file extension | Software602, Inc. | 602Tab Document |
| WLT file extension | NobleTech Limited. | Words Of Worship |
| WLX file extension | Microsoft | Microsoft Live Mesh Placeholder Format |
| WLZ file extension | Nullsoft | Winamp Language Pack Format |
| WM file extension | Microsoft | Windows Media Audio Or Video Format |
| WM2D file extension | Design Simulation Technologies, Inc. | Working Model 2D Data |
| WM3 file extension | MSC Software Corporation | VisualNastran Movie |
| WMA file extension | Microsoft | Windows Media Audio |
| WMB file extension | Conitec Datasystems, Inc | 3D GameStudio Map Entity |
| WMC file extension | Parametric Technology Corporation | MathCad Backup Of Startup Files |
| WMD file extension | N/A | Windows Media Player Download Package |
| WMDB file extension | Microsoft | Windows Media Player Database Format |
| WME file extension | Microsoft Corporation | Microsoft Windows Media Encoder Session Profile |
| WMF file extension | Microsoft | Windows Metafile Format |
| WMG file extension | WinMagic Inc. | SecureDoc Encrypted Hard Drive Control |
| WMGA file extension | Manga Reader | Web Manga Comics Document Format |
| WMI file extension | WorldMate Inc. | WorldMate Itinerary Data |
| WMK file extension | SourceForge.net | WebMake Documentation Source |
| WML file extension | N/A | Wireless Markup Language Document (WAP) |
| WMLC file extension | N/A | Wireless Markup Language Bytecode Document (WAP) |
| WMLS file extension | N/A | Wireless Markup Language Script File (WAP) |
| WMLSC file extension | N/A | Wireless Markup Language (WAP) Bytecode Script |
| WMMP file extension | Microsoft | Windows Movie Maker Project Format |
| WMN file extension | DARTECH, Inc. | DART Pro 98 Playlist |
| WMO file extension | Blizzard Entertainment | World Of Warcraft WoW Map Object |
| WMP file extension | Microsoft | Microsoft Windows Media HD Photo Format |
| WMR file extension | All Alex Inc. | Windows Media Recorder |
| WMS file extension | N/A | Windows Media Player Skins |
| WMT file extension | WinMount International | WinMount Format |
| WMU file extension | Wider Networks | WIND Tunnel WIND |
| WMV file extension | Microsoft | Windows Media Video Format |
| WMV3 file extension | N/A | Video |
| WMW file extension | Likno Software Inc. | Likno Web Modal Windows Builder |
| WMX file extension | N/A | Windows Media Redirector |
| WMZ file extension | Microsoft | Windows Media Player Compressed Skins Format |
| WNA file extension | Wider Networks | WIND Tunnel Assignment |
| WND file extension | Grassland, Soil & Water Research Laboratory | SWAT Wind Speed Input |
| WNF file extension | Corel Corporation | CorelDRAW Outline Font Description |
| WNK file extension | DebugMode | Wink Screen Capture Format |
| WNT file extension | Raven Software | Soldier Of Fortune II Waypoint |
| WNU file extension | Wider Networks | WIND Tunnel UMTS Measurement Data |
| WO file extension | The Database Managers, Inc. | DataFlex Web Object |
| WOA file extension | Apple | WebObjects Script Format |
| WOCK file extension | ROUTE 66 Switzerland GmbH | Route 66 For Mac |
| WOD file extension | Apple, Inc. | Apple WebObjects Web Application Method |
| WOFF file extension | WebFonts Working Group | Web Open Font Format Package Format |
| WOG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Obstacle Group |
| WOLF file extension | N/A | WOLF Document |
| WOLFQUEST file extension | Minnesota Zoo | WolfQuest Saved Game |
| WOO file extension | Apple, Inc. | Apple WebObjects |
| WOP file extension | Midnight Synergy | Wonderland Adventures Object Preset Format |
| WOR file extension | MapInfo | MapInfo Workspace Format |
| WORD file extension | N/A | MacWrite Document |
| WORDLIST file extension | Mariner Software | Desktop Poet Word List Format |
| WORK file extension | Bibble Labs | Bibble Work Queue Format |
| WORKFLOW file extension | Apple | Mac OS X Automator Format |
| WORKSHEET file extension | Bare Bones Software | BBEdit Shell Worksheet Format |
| WORKSPACE file extension | Adobe Systems | Adobe Applications Workspace Setting |
| WORLD file extension | WorldPainter | WorldPainter Minecraft Map Format |
| WOS file extension | NobleTech Limited. | Words Of Worship Output Settings |
| WOT file extension | PGP | Web Of Trust Format |
| WOTREPLAY file extension | Wargaming.net | World Of Tanks Battle Recording Format |
| WOV file extension | Cakewalk, Inc. | Cakewalk SONAR Cache Clip |
| WOW file extension | N/A | Grave Composer Module Format |
| WOWPREPLAY file extension | Wargaming.net | World Of Warplanes Replay |
| WOWPROJ file extension | AddOn Studio for World of Warcraft | AddOn Studio For World Of Warcraft Project Format |
| WOWSL file extension | WOW Slider | WOW Slider Plugin |
| WP file extension | Corel | WordPerfect Document Format |
| WP1 file extension | Eawag | MODAWEC Output Data |
| WP2 file extension | N/A | Winplot |
| WP3 file extension | Microsoft | Microsoft Photo Story Project Format |
| WP4 file extension | Corel | Corel WordPerfect 4 Format |
| WP42 file extension | N/A | Corel WordPerfect 4 For Mac Document |
| WP5 file extension | Corel | WordPerfect 5 Document Format |
| WP50 file extension | N/A | Corel WordPerfect 5 For Mac Document |
| WP6 file extension | Corel | Corel WordPerfect 6 For Mac Document Format |
| WP7 file extension | Corel | WordPerfect 7 Document Format |
| WP? file extension | Corel Corporation | Corel WordPerfect Document |
| WPA file extension | N/A | ACT! Word Processor Document Format |
| WPB file extension | Portalgraphics | OpenCanvas 1.1 Image |
| WPC file extension | Microsoft | Microsoft Word And Write Windows 95 WordPad Format Converter Format |
| WPC2 file extension | N/A | Corel WordPerfect 2/3 For Mac Document |
| WPD file extension | Corel | Corel WordPerfect Document Format |
| WPD0 file extension | N/A | Corel WordPerfect 1 For Mac Document |
| WPD1 file extension | N/A | Corel WordPerfect 1 For Mac Document |
| WPD2 file extension | Corel Corporation | Corel WordPerfect 2 For Mac Document |
| WPD3 file extension | N/A | Corel WordPerfect 3 For Mac Document |
| WPE file extension | Portalgraphics | OpenCanvas Record Format |
| WPF file extension | Corel | Corel WordPerfect Form Format |
| WPG file extension | Corel | Corel WordPerfect Graphic Format |
| WPG2 file extension | Corel Corporation | Corel WordPerfect Image |
| WPH file extension | N/A | Phoenix BIOS Format |
| WPJ file extension | Microsoft Corporation | Microsoft Works Wizard |
| WPK file extension | N/A | Corel WordPerfect Macro Format |
| WPL file extension | Microsoft | Microsoft Windows Media Player Playlist Format |
| WPM file extension | Corel | Corel WordPerfect Macro Format |
| WPN file extension | Intellicate, Ltd. | Schedule24 Schedule |
| WPO file extension | HOLUX Technology | Holux MapShow Format |
| WPOST file extension | Microsoft | Microsoft Windows Live Writer Post Format |
| WPOSTX file extension | Microsoft Corporation | Microsoft Windows Live Writer Post |
| WPP file extension | N/A | Corel WordPerfect Color Palette Format |
| WPR file extension | Apple, Inc. | Apple Logic Studio WaveBurner Plug-in Preset |
| WPRD file extension | Microsoft Corporation | Microsoft Word For Mac Print |
| WPROJ file extension | Audiokinetic | Wwise Project |
| WPS file extension | Microsoft | Microsoft Works Document Format |
| WPT file extension | Corel | Corel WordPerfect Document Template Format |
| WPW file extension | Corel | WP Works Word Processor Format |
| WPX file extension | N/A | Adobe Printer Description For Postscript Printing Format |
| WPZ file extension | Nullsoft, Inc. | WinAmp SkinZip |
| WQ! file extension | Corel Corporation | Corel Quattro Pro Compressed Spreadsheet |
| WQ0 file extension | Corel Corporation | Corel Quattro Pro For MS-DOS Spreadsheet |
| WQ1 file extension | Corel | Corel Quattro Pro For MS-DOS Spreadsheet Format |
| WQ2 file extension | Corel | Corel Quattro Pro For MS-DOS Spreadsheet Format |
| WQ? file extension | Corel Corporation | Corel Quattro Pro For MS-DOS Spreadsheet |
| WQL file extension | Microsoft Corporation | Microsoft Office |
| WR! file extension | IBM | Compressed Lotus Spreadsheet |
| WR1 file extension | IBM | Lotus Symphony Spreadsheet |
| WRAP file extension | Aladdin Systems, Inc. | ShrinkWrap MAC |
| WRAPPER file extension | The GNOME Project | Gnome Desktop |
| WRC file extension | Bulat Ziganshin | FreeArc Archive |
| WRD file extension | N/A | COREX Manually Verified Word Segmentation |
| WRF file extension | Cisco Systems | WebEx Recording Format |
| WRG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Resource Grid |
| WRI file extension | Microsoft | Windows Write Document Format |
| WRK file extension | Cakewalk | Cakewalk Music Project Format |
| WRL file extension | N/A | VRML Worlds Format |
| WRLK file extension | macropool GmbH | Web Research Document Link |
| WRM file extension | WinRADiO Communications | WinRAdiO Memory Format |
| WRP file extension | Geomagic | Geomagic 3D Wrap Format |
| WRPL file extension | The Widelands Development Team | Widelands Saved Game Format |
| WRPLWGF file extension | The Widelands Development Team | Widelands Initial Saved Game Format |
| WRR file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Roughness Rose |
| WRS file extension | Corel Corporation | Corel WordPerfect Windows Printer Driver |
| WRZ file extension | N/A | Cosmo Player VRML Worlds |
| WS file extension | Microsoft | Microsoft Windows Script Format |
| WS1 file extension | Michael Petrie | WordStar For Windows 1 Document |
| WS2 file extension | Michael Petrie | WordStar Document |
| WS3 file extension | Michael Petrie | WordStar For Windows 3 Document |
| WS4 file extension | Michael Petrie | WordStar For Windows 4 Document |
| WS5 file extension | Michael Petrie | WordStar For Windows 5 Document |
| WS6 file extension | Michael Petrie | WordStar For Windows 6 Document |
| WS7 file extension | Michael Petrie | WordStar For Windows Document |
| WSA file extension | Corel Corporation | Corel PaintShop Photo Pro Animation Shop Workspace |
| WSB file extension | N/A | Microsoft SharePoint Server 2007 Temporary |
| WSC file extension | Microsoft | Microsoft Windows Scripting Component Format |
| WSD file extension | Micropro International | WordStar 2000 Document |
| WSDD file extension | Apache Software Foundation | Apache Axis Web Service Deployment Descriptor (WSDD) |
| WSDL file extension | Microsoft | Microsoft Visual Studio Web Service Description Language Format |
| WSE file extension | Symantec Corporation | Wise File Format |
| WSET file extension | Microsoft Corporation | Microsoft Word For Mac Settings |
| WSF file extension | Microsoft | Microsoft Windows Scripting Format |
| WSG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Site Locations |
| WSH file extension | Microsoft | Microsoft Windows Scripting Host Format |
| WSI file extension | Symantec | Wise Windows Installer Project Format |
| WSIL file extension | N/A | IBM Web Services Inspection Language |
| WSK file extension | Ashampoo GmbH & Co. KG | Whisset Media Player Skin |
| WSL file extension | In-Situ Inc. | Win-Situ Data Logger |
| WSM file extension | Symantec | Symantec Wise Package Studio Merge Module Format |
| WSMDI file extension | Microsoft Corporation | Microsoft Visual Studio Test List |
| WSO file extension | Electronic Arts, Inc. | Sims 3 Mesh |
| WSP file extension | Microsoft | Microsoft Windows SharePoint Services Solution Framework Format |
| WSPAK file extension | WebsitePanel | WebsitePanel Backup Format |
| WSQ file extension | UTAU Team | UTAU |
| WSR file extension | AussieSoft | Crossword Genius |
| WSS file extension | Microsoft Corporation | Microsoft Windows Sound System |
| WSSP file extension | CommuniGate System | CommuniGate Custom Website Definition |
| WSSTYLES file extension | Microsoft Corporation | Microsoft Windows Vista Sidebar Style |
| WST file extension | Michael Petrie | WordStar Text |
| WSV file extension | Konica Minolta Holdings, Inc. | Konica Minolta SpectraMagic Data |
| WSW file extension | Aignesberger Software GmbH | WebSite-Watcher Bookmark |
| WSX file extension | Kurt Revis | SysEx Librarian For Mac OS X |
| WSYM file extension | Graphisoft | ArchiCAD For MAC Geometric Description Language |
| WSZ file extension | N/A | Winamp Skin Zip Format |
| WT0 file extension | MicroVision Development, Inc. | WordExpress Template |
| WT6 file extension | Software602, Inc. | 602Pro PC Suite Extension |
| WTA file extension | N/A | WinTune DLL Dynamic Link Library |
| WTB file extension | Win-Test | Win-Test Binary Log Format |
| WTBN file extension | Microsoft Corporation | Word For Mac Template |
| WTC file extension | Logitech | Logitech Web Camera Format |
| WTD file extension | Rockstar Games | Grand Theft Auto IV Textures Format |
| WTF file extension | Blizzard Entertainment | World Of Warcraft Server Configuration Text Format |
| WTFAV file extension | N/A | Watchtower Library Favourite |
| WTG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Wind Turbine Generator |
| WTH file extension | NIST | ContamX Weather |
| WTI file extension | N/A | WebTranslateIt Configuration |
| WTK file extension | Institute for Geotechnical Engineering IGT | WinTalk URL Address |
| WTL file extension | Microsoft Corporation | Windows Test Log |
| WTMP file extension | Microsoft Corporation | Microsoft Word For Mac 5 Temporary |
| WTP file extension | Satish Kumar | Wink Template |
| WTPL file extension | Ambrosia Software | WireTap Studio Library |
| WTPT file extension | Ambrosia Software | WireTap Studio Packaged Track |
| WTR file extension | Microsoft | Microsoft Encarta Format |
| WTS file extension | Serif Europe Ltd. | WebPlus Template |
| WTT file extension | Likno Software Inc. | Likno Web/HTML Tooltips Builder |
| WTV file extension | Microsoft | Microsoft Windows Media Center Recorded Television Format |
| WTX file extension | N/A | WinTune Export Text Document Format |
| WUI file extension | Ipswitch, Inc. | WhatsUp Gold Network Map Polling Statistics |
| WUL file extension | WinUHA | WinUHA Language Format |
| WUP file extension | Ipswitch, Inc. | WhatsUp Gold Network Map |
| WUS file extension | WUSSoft | WUTG Tagged Audio Format |
| WUSIKSND file extension | Wusik | Wusik Station Multisampled Sound |
| WUT file extension | N/A | WUTG Editor Tag Format |
| WV file extension | WavPack | WavPack Lossless Compressed Audio Format |
| WVC file extension | WavPack | WawPack Lossless Compressed Audio Format Format Correction Format |
| WVD file extension | Star Finanz GmbH | StarMoney Filter Zvl32 |
| WVE file extension | CyberLink | WaveEditor Project Format |
| WVL file extension | N/A | Wavelet Bitmap Format |
| WVM file extension | Ricardo plc. | WAVE Input |
| WVP file extension | Magic Hills | MagicHTML Web Video Player Project |
| WVX file extension | N/A | Windows Media Video Redirector Format |
| WVXML file extension | Adrian Wright | AudioPlayer XML Playlist |
| WW6 file extension | Nolo | Nolo Willmaker 6 Will |
| WWA file extension | N/A | WebSite-Watcher Archive |
| WWB file extension | Corel Corporation | Corel WordPerfect Button Bar |
| WWCX file extension | Adobe Systems Incorporated | Adobe InCopy |
| WWD file extension | Microsoft | Microsoft Works Wizards Format |
| WWF file extension | WWF International | WWF Rant Pakk Sound Format |
| WWG file extension | SINTEF | CARE-S InfoWorks Wastewater Data |
| WWH file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Workspace |
| WWK file extension | Corel Corporation | Corel WordPerfect Keyboard Layout |
| WWL file extension | Microsoft Corporation | Microsoft Word Add-in |
| WWP file extension | Microsoft Corporation | Microsoft Works Wizards |
| WWQ file extension | Grassland, Soil & Water Research Laboratory | SWAT Watershed Water Quality Input |
| WWR file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Resource Grid |
| WWS file extension | Microsoft Corporation | Microsoft Works Wizards |
| WWT file extension | PC SOFT | WinDev Page Template |
| WWU file extension | Audiokinetic | Wwise Work Unit Format |
| WX file extension | Microsoft | Flight Simulator Weather Format |
| WXD file extension | Relic Entertainment Inc. | Homeworld Musc Resource Game |
| WXF file extension | SYNAMETIRCS | WinSQL Scheduled Task |
| WXI file extension | Microsoft Corporation | WiX Include |
| WXL file extension | Microsoft Corporation | WiX Localization |
| WXMX file extension | Andrej Vodopivec | WxMaxima Document |
| WXP file extension | Symbol Dynamics | EXP For Windows Document |
| WXR file extension | wxWidgets Team | WxWindgets Resource |
| WXS file extension | The Code::Blocks Team | Code::Blocks XML |
| WYC file extension | wyDay | WyBuild Version Number |
| WYP file extension | wyDay | WyBuild Definitions |
| WYS file extension | wyDay | WyBuild Server |
| WYU file extension | wyDay | WyBuild Update |
| WYZ file extension | N/A | WYZTracker Format |
| WZ file extension | NEXON | MapleStory Game Data Archive |
| WZA file extension | SPI | Encryption Wizard Archive |
| WZCONFIG file extension | Corel | WinZip E-mail Configuration Format |
| WZMUL file extension | Corel | WinZip Multi-user Registration Format |
| WZN file extension | AvniTech Solutions | WhizFolders Document |
| WZS file extension | Microsoft Corporation | Microsoft Word Wizard |
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