| .w | OpenEdge Architect Source Code Format |
| .w01 | Yamaha Dog Audio Sample Format |
| .w02 | Yamaha Cat Audio Sample Format |
| .w03 | Yamaha Pig Audio Sample |
| .w04 | Yamaha Cattle Audio Sample |
| .w05 | Yamaha Horse Audio Sample |
| .w06 | Yamaha Lion Audio Sample |
| .w07 | Yamaha Elephant Audio Sample |
| .w08 | Yamaha Goat Audio Sample |
| .w09 | Yamaha Sea-lion Audio Sample |
| .w20 | Windows 2000 Related |
| .w2a | Yamaha Motif All Format |
| .w2d | Autodesk Design (Drawing) Web Format 2D |
| .w2e | Motif Rack ES Voice Editor |
| .w2m | Solo Explorer Transcription |
| .w2p | Webit |
| .w2v | Yamaha Motif Voices Format |
| .w2w | Yamaha Motif Waveforms Format |
| .w30 | Ventura Publisher Printer Font |
| .w31 | Windows 3.1 Startup |
| .w32 | WinCAPs Subtitle Format |
| .w3d | Adobe Shockwave 3D Scene Export Format |
| .w3e | Motif Rack ES Voice Editor |
| .w3g | Blizzard Warcraft III Game Replay Format |
| .w3i | Warcraft III Map Related |
| .w3l | W3launch |
| .w3m | Warcraft 3 Map Format |
| .w3n | Warcraft 3 Frozen Throne Campaign Format |
| .w3p | Warcraft 3 Progress |
| .w3u | Warcraft 3 Custom Units |
| .w3v | Warcraft 3 Campaign Progress Record |
| .w3x | Blizzard Warcraft III Expansion Map Format |
| .w3z | Blizzard Warcraft III Saved Game Format |
| .w40 | Windows 95 Backup Format |
| .w44 | DBASE Temporary |
| .w4a | Audio |
| .w51 | Corel WordPerfect 5.1 Document |
| .w5s | Winamp CDDB Database |
| .w60 | Corel WordPerfect 6.0 Document |
| .w61 | Corel WordPerfect 6.1 Document |
| .w64 | Sonic Foundry Wave-64 Format |
| .w6bn | Microsoft Word 6 For Mac Document |
| .w6e | Motif Rack ES Voice Editor |
| .w6w | Microsoft Word 6 Document |
| .w7a | Yamaha Motif ES Format |
| .w7e | Motif Rack ES Voice Editor |
| .w7v | Yamaha Motif ES Voices Format |
| .w7w | Yamaha Motif ES Waveforms |
| .w8bn | Microsoft Word 98 For Mac Document |
| .w8e | Motif Rack ES Voice Editor |
| .w8tn | Microsoft Word 98 For Mac Template |
| .w8v | Yamaha Motif ES Sample Data |
| .w95 | Windows 95 Data |
| .w98 | Microsoft Windows 98 Related Data |
| .w9e | Motif Rack ES Voice Editor |
| .w?? | Yamaha SY-series And TX16W Wave |
| .wa! | GigaStudio/GigaSampler Compressed Wave |
| .wa0 | Magix Music Studio |
| .wa2 | Wonderland Adventures Custom Game Format |
| .wab | Microsoft Windows Address Book Format |
| .wac | WISCO Accounts Storage |
| .wad | Doom Wad Format |
| .waf | Microsoft Internet Explorer For Mac Cache |
| .waff | IE Saved Web Page |
| .wag | Train Simulator Wagon |
| .wagame | Worms Armageddon Game Replay |
| .wai | Warcraft 3 AI Data |
| .waj | WinAutomation |
| .wal | Winamp 3 Skin Format |
| .wand | Apple GarageBand Project Format |
| .wap | Wireless Bitmap (level 0) Image Format |
| .war | Java Web Archive Format |
| .wat | IBM Voice Type Languages Map |
| .wav | WAVe PCM Sound, Standard Windows Sound Format |
| .wave | WAVe PCM Sound Format |
| .wax | Windows Media Audio Redirector Format |
| .wa~ | Microsoft Address Book |
| .wb | Apple Logic Studio WaveBurner Document |
| .wb0 | Corel Quattro Pro Spreadsheet |
| .wb1 | Corel Quattro Pro Spreadsheet Format |
| .wb2 | Corel Quattro Pro Spreadsheet Format |
| .wb3 | Corel Quattro Pro Spreadsheet Format |
| .wb4 | WindowBlinds Default Skin |
| .wb? | Corel Quattro Pro Spreadsheet |
| .wba | WindowBlinds Desktop Visual Style |
| .wbb | WinBackup Backup Format |
| .wbc | Webshots Collection Image Format |
| .wbcat | Microsoft Windows Backup Information Format |
| .wbd | Microsoft Works Database Format |
| .wbdp | ANSYS Workbench Project Global |
| .wbf | Microsoft Windows Batch |
| .wbfs | Nintendo Wii Backup Format System Format |
| .wbk | Microsoft Word Auto-backup Document Format |
| .wbm | Wireless Bitmap Image Format |
| .wbmp | Wireless Bitmap Image Format |
| .wbo | DataFlex Web Business Object |
| .wbp | Webshots Image |
| .wbpj | ANSYS Workbench Project |
| .wbpz | ANSYS Update Package |
| .wbs | WebExpress Website |
| .wbt | WinBatch Script Format |
| .wbu | Samsung PC Studio Backup |
| .wbverify | Microsoft Windows Backup |
| .wbx | Webshots |
| .wbxml | WAP Binary XML Format |
| .wbz | Webshots Image Format |
| .wc | Total Commander File Tree Info |
| .wcat | WinCatalog Collection Format |
| .wcd | Microsoft Works Calendar Format |
| .wcf | WebEx Saved Chat Session Format |
| .wch | Corel WordPerfect Macro Facility |
| .wcinv-ms-p2p | Windows Meeting Space |
| .wck | WaterCAD |
| .wcl | WellCAD Log |
| .wcm | Microsoft Works Communications Script Format |
| .wcp | WinDVD Creator Project Format |
| .wcpl | Webcopier Project Settings |
| .wcst | Wirecast Document |
| .wct | WordCast Project |
| .wcx | Total Commander Plug-in |
| .wcxf | WorldCard Exchange |
| .wcz | Chameleon Clock Wallpaper Format |
| .wd | Earth 2140-2160 Game Archive |
| .wd0 | WordExpress Document |
| .wd1 | WordExpress Document |
| .wd2 | Info Select Database |
| .wd3 | Offline Explorer Directory Index Format |
| .wdb | Microsoft Works Database Format |
| .wdbn | Microsoft World For Mac Document |
| .wdcd | Word 5 For Mac Custom Dictionary |
| .wdd | AutoCAD Electrical Description List |
| .wdf | Microsoft Windows Driver Foundation Format |
| .wdgp | Word For Mac Add-in |
| .wdgt | Apple Mac OS X Dashboard Widget |
| .wdgtproj | Dashcode Widget Project |
| .wdi | WINDEV Component Description |
| .wdic | Word 5 For Mac Extension |
| .wdk | WINDEV Component |
| .wdl | World Definition Language Script |
| .wdll | Word 6 For Mac Add-in |
| .wdm | BASINS Meteorological Database |
| .wdn | AutoCAD Electrical Project-related |
| .wdoc | WriteOnline Document |
| .wdp | Windows Media HD Photo |
| .wdproj | Microsoft Visual Studio Web Deployment Project |
| .wdq | WDQ Offline Explorer Queue Format |
| .wdr | Star Wars: Tie Fighter Media |
| .wdseml | Mozilla Thunderbird Mail Message Format |
| .wdt | WinSQL Schema Diff Template |
| .wdv | TracePlus Web Detective |
| .wdw | WINDEV Window Format |
| .wdx | Total Commander Content Plugin |
| .wdx9 | Microsoft Word For Mac Wizard |
| .wdy | WINDEV Run-time Template |
| .we | Fifa2000 Be Game |
| .we? | Standard Mail Archive |
| .wea | Ecotect Weather Format |
| .weap | Quake 3 Id Tech 3 Game Engine Weapon Format |
| .web | Xara Web Document Format |
| .weballowblocklist | Windows Vista Parental Control Settings |
| .webarchive | Apple Safari Web Archive Format |
| .webarchivexml | Android 3.1 Browser Saved Website Format |
| .webbookmark | Apple Safari Bookmark Format |
| .webdoc | Box Service Document Format |
| .webhistory | Apple Safari History Item Format |
| .webinar | GoToWebinar Session |
| .webinfo | Visual Studio .NET |
| .webintents | Webintents |
| .webloc | Apple Mac OS X Finder Internet URL |
| .webm | Matroska WebM Video Format |
| .weboogl | Web Object Oriented Graphics Library |
| .webp | WebP Image |
| .webpart | Microsoft SharePoint Web Part |
| .webpnp | Web Point And Print Format |
| .webpublishhistory | Alpha Five |
| .websettings | JEE2 Web Project Settings |
| .website | Internet Explorer 9 Pinned Site Shortcut Format |
| .webtemplate | Apple IWeb Template Format |
| .webtest | Microsoft Visual Studio Web Test |
| .webtestresult | Microsoft Visual Studio Web Test Result |
| .webtheme | Apple IWeb Theme Format |
| .webz | Web Format Compressed EBook Format |
| .wed | BioWare Infinity Game Engine Graphic Display Info |
| .wef | Exchange File System Format |
| .weightoutput | SAM Sequence |
| .weights | SAM Sequence Weights |
| .wem | Wwise Encoded Media Audio Format |
| .wep | EPublisher Stationery Design Project |
| .wer | Microsoft Windows Application Error Report |
| .wet | WinSQL Export Template |
| .wf | FIFA 2000 Play |
| .wf1 | EViews Work |
| .wf4 | Creo Parametric Symbol |
| .wfb | Turtle Beach WaveFront Bank Format |
| .wfc | Windows Wireless Network Settings Format |
| .wfd | Turtle Beach WaveFront Drum Set Format |
| .wff | Dataplore Wavelet Filter |
| .wfk | Delphi |
| .wfl | Offline Design For Workflow Process |
| .wflow | Apple Mac OS X Automator Workflow |
| .wfm | DBASE Form Format |
| .wfo | Delphi Runimage |
| .wfp | Turtle Beach WaveFront Audio Format |
| .wfs | Microsoft Windows Installation Script |
| .wft | GTA 4 Car Model Format |
| .wfv | DataSet Vision Query Report |
| .wfw | Windows Firewall Policy Export |
| .wfx | WinFax |
| .wg | Fifa 2000 Game |
| .wg1 | Lotus 1-2-3 Worksheet |
| .wg2 | Lotus 1-2-3 For OS/2 Worksheet |
| .wgameprofile | X-Men Origins: Wolverine Profile |
| .wgf | Widelands Game Format |
| .wgn | SWAT Wather Generator Input |
| .wgom | CompeGPS Land Google Earth Remote Map |
| .wgp | Web Gallery Project Format |
| .wgs | Walk-Graph Segment |
| .wgt | Opera Widgets Format |
| .wgz | S60 Web Runtime Widget Package Format |
| .whb | Apple IPod Backup Image |
| .whd | Hitman Game Archive |
| .whirld | Unity Whirld Format |
| .whlp | Microsoft Word For Mac Help |
| .whm | Warhammer 40,000: Dawn Of War Model |
| .wht | Microsoft NetMeeting White Board Document |
| .whtt | WinHTTrack Project |
| .wi | Wavelet Compressed Image Format |
| .wia | Nintendo Wii ISO Archive |
| .wic | J Wavelet Image Codec Image Format |
| .WiCSaveGame | World In Conflict Saved Game |
| .wid | Corel Ventura Publisher Width Table Format |
| .widget | Yahoo! Widget Format |
| .wif | Weaving Information Format |
| .wiff | AB SCIEX Windows Interchange File Format |
| .wii | Nintendo WII Raw Disk Image Format |
| .wiki | Wiki Markup Source |
| .wil | WinImage Data Format |
| .wim | Windows Imaging Format Archive Format |
| .wimp | Microsoft Windows Icon Palette |
| .win | Windows Backup Format |
| .win32manifest | Microsoft Win32 Manifest |
| .wince | Microsoft Windows CE Program Executable |
| .winclone | Winclone Disk Image Format |
| .windowslivecontact | Microsoft Live Messenger Format |
| .windowslivegroup | Windows Live Mail |
| .winmd | Windows Runtime Metadata Output |
| .wip | CyberScrub Privacy Suite Wipe |
| .wipeinfo | Norton Utilities Sendto |
| .wipeslack | Norton Utilities Sendto |
| .wiq | Microsoft Visual Studio Format |
| .wire | Wavefront Studio Wireframe |
| .wis | InstallShield Install Help |
| .wit | WebIdeaTree Project |
| .wix | Xara Internal Graphics Data |
| .wixlib | WiX Library |
| .wixmsp | WiX XML Patch |
| .wixmst | WiX Transform |
| .wixobj | WiX Object |
| .wixout | WiX XML Output |
| .wixpdb | WiX Debug |
| .wixproj | WiX Windows Installer XML Project |
| .wiz | Microsoft Office Wizard Format |
| .wizhtml | Microsoft Access HTML Template |
| .wj | Fifa 2000 Game |
| .wje | WinJournal Entry Format |
| .wjf | WinZip Job Format |
| .wjr | ReGet Deluxe Data Format |
| .wk! | Lotus 1-2-3 Spreadsheet |
| .wk1 | Lotus 1-2-3 Version 2.x Spreadsheet Format |
| .wk2 | Lotus 1-2-3 Version 2 Spreadsheet Format |
| .wk3 | Lotus 1-2-3 Version 3.x Spreadsheet Format |
| .wk4 | Lotus 1-2-3 Version 4.x Spreadsheet Format |
| .wk5 | Lotus 1-2-3 Version 5 Spreadsheet Format |
| .wkb | Corel WordPerfect Document |
| .wke | Lotus 1-2-3 Educational Version Spreadsheet Format |
| .wkf | KF Web Server Default Control |
| .wki | Lotus 1-2-3 Version 2 Spreadsheet Format |
| .wkp | Web CEO Database Backup |
| .wkq | Corel Quattro Pro For MS-DOS Spreadsheet |
| .wks | Microsoft Works Spreadsheet Document Format |
| .wkt | Garmin Training Schedule |
| .wku | Lotus 1-2-3 Spreadsheet Format |
| .wkz | Wingz Spreadsheet |
| .wl | WISCO Word Power Word Lists And Definitions |
| .wl1 | Wolfenstein 3D Shareware Version Format |
| .wl3 | Wolfenstein 3D Registered Version |
| .wl6 | Wolfenstein 3D Registered Version Format |
| .wlc | Microsoft Live Mesh |
| .wld | ArcView CAD Datasets World Format |
| .wlf | Microsoft Windows Dr. Watson Log |
| .wlg | Well Logger V1 |
| .wlk | Weatherlink Data |
| .wll | Microsoft Word Add-in Format |
| .wlm | CompW Image Format |
| .wlmp | Microsoft Windows Live Movie Maker Video Project Format |
| .wlp | Worldlabel.com Label Designer Format |
| .wls | 602Tab Document |
| .wlt | Words Of Worship |
| .wlx | FileMaker Pro Plug-in |
| .wlz | WinImage Format |
| .wm | Windows Media Audio Or Video Format |
| .wm2d | Working Model 2D Data |
| .wm3 | VisualNastran Movie |
| .wma | Windows Media Audio |
| .wmb | 3D GameStudio Map Entity |
| .wmc | Corel WordPerfect Macro |
| .wmd | Windows Media Player Download Package |
| .wmdb | Windows Media Player Database Format |
| .wme | Microsoft Windows Media Encoder Session Profile |
| .wmf | Windows Metafile Format |
| .wmg | SecureDoc Encrypted Hard Drive Control |
| .wmga | Web Manga Comics Document Format |
| .wmi | WorldMate Itinerary Data |
| .wmk | WebMake Documentation Source |
| .wml | Wireless Markup Language Document (WAP) |
| .wmlc | Wireless Markup Language Bytecode Document (WAP) |
| .wmls | Wireless Markup Language Script File (WAP) |
| .wmlsc | Wireless Markup Language (WAP) Bytecode Script |
| .wmmp | Windows Movie Maker Project Format |
| .wmn | DART Pro 98 Playlist |
| .wmo | World Of Warcraft WoW Map Object |
| .wmp | Microsoft Windows Media HD Photo Format |
| .wmr | Windows Media Recorder |
| .wms | Windows Media Player Skins |
| .wmt | WinMount Format |
| .wmu | WIND Tunnel WIND |
| .wmv | Windows Media Video Format |
| .wmv3 | Video |
| .wmw | Likno Web Modal Windows Builder |
| .wmx | Windows Media Redirector |
| .wmz | Windows Media Player Compressed Skins Format |
| .wn | NeXT WriteNow Text Document |
| .wna | WIND Tunnel Assignment |
| .wnd | SWAT Wind Speed Input |
| .wnf | CorelDRAW Outline Font Description |
| .wnk | Wink Screen Capture Format |
| .wnt | Soldier Of Fortune II Waypoint |
| .wnu | WIND Tunnel UMTS Measurement Data |
| .wo | DataFlex Web Object |
| .woa | WebObjects Script Format |
| .wock | Route 66 For Mac |
| .wod | Apple WebObjects Web Application Method |
| .woff | Web Open Font Format Package Format |
| .wog | WAsP Obstacle Group |
| .wolf | WOLF Document |
| .wolfquest | WolfQuest Saved Game |
| .woo | Apple WebObjects |
| .wop | Wonderland Adventures Object Preset Format |
| .wor | MapInfo Workspace Format |
| .word | MacWrite Document |
| .wordlist | Desktop Poet Word List Format |
| .work | Bibble Work Queue Format |
| .workflow | Mac OS X Automator Format |
| .worksheet | BBEdit Shell Worksheet Format |
| .workspace | Adobe Applications Workspace Setting |
| .world | WorldPainter Minecraft Map Format |
| .wos | Words Of Worship Output Settings |
| .wot | Web Of Trust Format |
| .wotreplay | World Of Tanks Battle Recording Format |
| .wov | Cakewalk SONAR Cache Clip |
| .wow | Grave Composer Module Format |
| .wowpreplay | World Of Warplanes Replay |
| .wowproj | AddOn Studio For World Of Warcraft Project Format |
| .wowsl | WOW Slider Plugin |
| .wp | WordPerfect Document Format |
| .wp1 | MODAWEC Output Data |
| .wp2 | Winplot |
| .wp3 | Microsoft Photo Story Project Format |
| .wp4 | Corel WordPerfect 4 Format |
| .wp42 | Corel WordPerfect 4 For Mac Document |
| .wp5 | WordPerfect 5 Document Format |
| .wp50 | Corel WordPerfect 5 For Mac Document |
| .wp6 | Corel WordPerfect 6 For Mac Document Format |
| .wp7 | WordPerfect 7 Document Format |
| .wp? | Corel WordPerfect Document |
| .wpa | ACT! Word Processor Document Format |
| .wpb | Windows Phone Device Manager Backup Format |
| .wpc | Microsoft Word And Write Windows 95 WordPad Format Converter Format |
| .wpc2 | Corel WordPerfect 2/3 For Mac Document |
| .wpd | Corel WordPerfect Document Format |
| .wpd0 | Corel WordPerfect 1 For Mac Document |
| .wpd1 | Corel WordPerfect 1 For Mac Document |
| .wpd2 | Corel WordPerfect 2 For Mac Document |
| .wpd3 | Corel WordPerfect 3 For Mac Document |
| .wpe | OpenCanvas Record Format |
| .wpf | Corel WordPerfect Form Format |
| .wpg | Corel WordPerfect Graphic Format |
| .wpg2 | Corel WordPerfect Image |
| .wph | WAsP Project Format |
| .wpj | Microsoft Works Wizard |
| .wpk | Corel WordPerfect Macro Format |
| .wpl | Microsoft Windows Media Player Playlist Format |
| .wpm | Corel WordPerfect Macro Format |
| .wpn | Schedule24 Schedule |
| .wpo | Holux MapShow Format |
| .wpost | Microsoft Windows Live Writer Post Format |
| .wpostx | Microsoft Windows Live Writer Post |
| .wpp | Corel WordPerfect Color Palette Format |
| .wpr | Apple Logic Studio WaveBurner Plug-in Preset |
| .wprd | Microsoft Word For Mac Print |
| .wproj | Wwise Project |
| .wps | Microsoft Works Document Format |
| .wpt | Corel WordPerfect Document Template Format |
| .wpw | Corel WordPerfect Document Format |
| .wpx | Adobe Printer Description For Postscript Printing Format |
| .wpz | WinAmp SkinZip |
| .wq! | Corel Quattro Pro Compressed Spreadsheet |
| .wq0 | Corel Quattro Pro For MS-DOS Spreadsheet |
| .wq1 | Corel Quattro Pro For MS-DOS Spreadsheet Format |
| .wq2 | Corel Quattro Pro For MS-DOS Spreadsheet Format |
| .wq? | Corel Quattro Pro For MS-DOS Spreadsheet |
| .wql | Microsoft Office |
| .wr! | Compressed Lotus Spreadsheet |
| .wr1 | Lotus Symphony Spreadsheet |
| .wrap | ShrinkWrap MAC |
| .wrapper | Gnome Desktop |
| .wrc | FreeArc Archive |
| .wrd | COREX Manually Verified Word Segmentation |
| .wrf | WebEx Recording Format |
| .wrg | WAsP Resource Grid |
| .wri | Windows Write Document Format |
| .wrk | Cakewalk Music Project Format |
| .wrl | VRML Worlds Format |
| .wrlk | Web Research Document Link |
| .wrm | WinRAdiO Memory Format |
| .wrp | Geomagic 3D Wrap Format |
| .wrpl | Widelands Saved Game Format |
| .wrpl.wgf | Widelands Initial Saved Game Format |
| .wrr | WAsP Roughness Rose |
| .wrs | Corel WordPerfect Windows Printer Driver |
| .wrz | Cosmo Player VRML Worlds |
| .ws | Microsoft Windows Script Format |
| .ws1 | WordStar For Windows 1 Document |
| .ws2 | WordStar 2000 Document |
| .ws3 | WordStar For Windows 3 Document |
| .ws4 | WordStar For Windows 4 Document |
| .ws5 | WordStar For Windows 5 Document |
| .ws6 | WordStar For Windows 6 Document |
| .ws7 | WordStar For Windows Document |
| .wsa | Corel PaintShop Photo Pro Animation Shop Workspace |
| .wsb | Microsoft SharePoint Server 2007 Temporary |
| .wsc | Microsoft Windows Scripting Component Format |
| .wsd | WordStar 2000 Document |
| .wsdd | Apache Axis Web Service Deployment Descriptor (WSDD) |
| .wsdl | Microsoft Visual Studio Web Service Description Language Format |
| .wse | Wise File Format |
| .wset | Microsoft Word For Mac Settings |
| .wsf | Microsoft Windows Scripting Format |
| .wsg | WAsP Site Locations |
| .wsh | Microsoft Windows Scripting Host Format |
| .wsi | Wise Windows Installer Project Format |
| .wsil | IBM Web Services Inspection Language |
| .wsk | Whisset Media Player Skin |
| .wsl | Win-Situ Data Logger |
| .wsm | Symantec Wise Package Studio Merge Module Format |
| .wsmdi | Microsoft Visual Studio Test List |
| .wso | Sims 3 Mesh |
| .wsp | Microsoft Windows SharePoint Services Solution Framework Format |
| .wspak | WebsitePanel Backup Format |
| .wsq | UTAU |
| .wsr | Crossword Genius |
| .wss | Microsoft Windows Sound System |
| .wssp | CommuniGate Custom Website Definition |
| .wsstyles | Microsoft Windows Vista Sidebar Style |
| .wst | NextSTART Theme |
| .wsv | Konica Minolta SpectraMagic Data |
| .wsw | WorkShelf Theme |
| .wsx | SysEx Librarian For Mac OS X |
| .wsym | ArchiCAD For MAC Geometric Description Language |
| .wsz | Winamp Skin Zip Format |
| .wt0 | WordExpress Template |
| .wt6 | 602Pro PC Suite Extension |
| .wta | WinTune DLL Dynamic Link Library |
| .wtb | Win-Test Binary Log Format |
| .wtbn | Word For Mac Template |
| .wtc | Logitech Web Camera Format |
| .wtd | Grand Theft Auto IV Textures Format |
| .wtf | World Of Warcraft Server Configuration Text Format |
| .wtfav | Watchtower Library Favourite |
| .wtg | WAsP Wind Turbine Generator |
| .wth | ContamX Weather |
| .wti | WebTranslateIt Configuration |
| .wtk | WinTalk URL Address |
| .wtl | Windows Test Log |
| .wtmp | Microsoft Word For Mac 5 Temporary |
| .wtp | Wink Template |
| .wtpl | WireTap Studio Library |
| .wtpt | WireTap Studio Packaged Track |
| .wtr | Microsoft Encarta Format |
| .wts | WebPlus Template |
| .wtt | Likno Web/HTML Tooltips Builder |
| .wtv | Microsoft Windows Media Center Recorded Television Format |
| .wtx | WinTune Export Text Document Format |
| .wui | WhatsUp Gold Network Map Polling Statistics |
| .wul | WinUHA Language Format |
| .wup | WhatsUp Gold Network Map |
| .wus | WUTG Tagged Audio Format |
| .wusiksnd | Wusik Station Multisampled Sound |
| .wut | WUTG Editor Tag Format |
| .wv | WavPack Lossless Compressed Audio Format |
| .wvc | WawPack Lossless Compressed Audio Format Format Correction Format |
| .wvd | StarMoney Filter Zvl32 |
| .wve | DivX Movie Conversion Component Format |
| .wvl | Wavelet Bitmap Format |
| .wvm | WAVE Input |
| .wvp | Symantec Virtual Package Editor Virtual Software Project Format |
| .wvx | Windows Media Video Redirector Format |
| .wvxml | AudioPlayer XML Playlist |
| .ww6 | Nolo Willmaker 6 Will |
| .wwa | WebSite-Watcher Archive |
| .wwb | Corel WordPerfect Button Bar |
| .wwcx | Adobe InCopy |
| .wwd | Microsoft Works Wizards Format |
| .wwf | WWF Rant Pakk Sound Format |
| .wwg | CARE-S InfoWorks Wastewater Data |
| .wwh | WAsP Workspace |
| .wwk | Corel WordPerfect Keyboard Layout |
| .wwl | Microsoft Word Add-in |
| .wwp | Microsoft Works Wizards |
| .wwq | SWAT Watershed Water Quality Input |
| .wwr | WAsP Resource Grid |
| .wws | Writing With Symbols Document |
| .wwt | WinDev Page Template |
| .wwu | Wwise Work Unit Format |
| .wx | Flight Simulator Weather Format |
| .wxd | Homeworld Musc Resource Game |
| .wxf | WinSQL Scheduled Task |
| .wxi | WiX Include |
| .wxl | WiX Localization |
| .wxmx | WxMaxima Document |
| .wxp | EXP For Windows Document |
| .wxr | WxWindgets Resource |
| .wxs | Code::Blocks XML |
| .wyc | WyBuild Version Number |
| .wyp | WyBuild Definitions |
| .wys | WyBuild Server |
| .wyu | WyBuild Update |
| .wyz | WYZTracker Format |
| .wz | MapleStory Game Data Archive |
| .wza | Encryption Wizard Archive |
| .wzconfig | WinZip E-mail Configuration Format |
| .wzmul | WinZip Multi-user Registration Format |
| .wzn | WhizFolders Document |
| .wzs | Microsoft Word Wizard |
