| Extension | Summary |
|---|
| .W | Google Toolbar Search History File |
| .W01 | Samsung Recovery File |
| .W02 | Split Archive File |
| .W32 | Win32 Makefile |
| .W3D | Adobe Shockwave 3D File |
| .W3G | Warcraft 3 Replay File |
| .W3M | Warcraft 3 Map File |
| .W3N | Warcraft 3 Expansion Campaign Map File |
| .W3X | Warcraft 3 Expansion Map FIle |
| .W3Z | Warcraft 3 Saved Game File |
| .W64 | Sony Wave64 Audio File |
| .WA | Windows Addon Archive |
| .WA2 | Wonderland Adventures Custom Adventure File |
| .WAB | Windows Address Book |
| .WAC | Inkling Sketch XML File |
| .WAD | Danganronpa Game Data File |
| .WAFF | Internet Explorer for Mac Web Archive |
| .WAGAME | Worms Armageddon Game Recording |
| .WAL | Winamp Modern Skin |
| .WALLET | Wallet Ransomware |
| .WALLETX | Enpass Data File |
| .WAM | Worms Armageddon Mission File |
| .WAND | GarageBand Magic Template |
| .WAPPROJ | Windows Application Packaging Project File |
| .WAR | Java Web Archive |
| .WARC | Web Archive |
| .WASM | WebAssembly Binary File |
| .WASTICKERS | Sticker Maker Sticker Pack File |
| .WAV | DTS-WAV File |
| .WAVE | WAVE Sound File |
| .WAX | Windows Media Audio Redirect |
| .WB0 | Webshots Picture File |
| .WB1 | Webshots Picture File |
| .WB2 | Webshots Picture File |
| .WB3 | Corel Quattro Pro 7 and 8 File |
| .WBA | WindowBlinds Compressed Skin |
| .WBB | WinBackup Archive |
| .WBC | Webshots Collection File |
| .WBCAT | Windows Backup Catalog File |
| .WBD | Webshots Picture File |
| .WBF1 | Wii Backup File System File |
| .WBFS | Wii Backup File System File |
| .WBI | Compact ISO File |
| .WBK | Microsoft Word Document Backup File |
| .WBM | Webmin Module |
| .WBMP | Wireless Bitmap Image File |
| .WBP | Webshots Collection File |
| .WBS | WebBlender Project File |
| .WBT | BattleBlock Theater Music File |
| .WBX | Winbox Address Book |
| .WBXML | WAP Binary XML File |
| .WBZ | Webshots Download Picture File |
| .WC | Valve Hammer Configuration File |
| .WC6 | 6th Generation Pokémon Wondercard File |
| .WCAT | WinCatalog Collection File |
| .WCD | Works Calendar File |
| .WCF | WebEx Saved Chat Session |
| .WCINV | Windows Meeting Space Invitation File |
| .WCM | Microsoft Works Communications Script |
| .WCP | WinCHM Project File |
| .WCP_SETTINGS | Alpha Five Settings File |
| .WCRY | WannaCry Virus Encrypted File |
| .WCX | RemoteApp and Desktop Connections Configuration File |
| .WCZ | Chameleon Clock Wallpaper File |
| .WD3 | Offline Explorer Data File |
| .WDB | Blizzard World of Warcraft Database File |
| .WDF | Windows Driver Foundation File |
| .WDGT | Adobe Captivate Widget File |
| .WDGTPROJ | Dashcode Widget Project |
| .WDL | World Definition Language Script |
| .WDMON | Wireless Diagnostics Monitor File |
| .WDP | Windev Project File |
| .WDQ | Offline Explorer Queue File |
| .WDSEML | Thunderbird Searchable Email File |
| .WDW | WinDev Window File |
| .WDZ | WDZip Compressed Archive |
| .WEA | Ecotect Weather File |
| .WEAP | Quake 3 Engine Weapon File |
| .WEAVELIBRARY | Painter Weave Library |
| .WEB | Xara Web Document |
| .WEBA | WebM Audio File |
| .WEBAPP | Firefox Web App Manifest File |
| .WEBARCHIVE | Safari Web Archive |
| .WEBARCHIVEXML | Android Web Browser Archive |
| .WEBBOOKMARK | Safari Web Bookmark File |
| .WEBDOC | Box.net Web Document |
| .WEBHISTORY | Safari Web History File |
| .WEBLOC | macOS Website Location |
| .WEBM | WebM Video |
| .WEBMANIFEST | Progressive Web Application Manifest |
| .WEBP | WebP Image |
| .WEBPNP | Web Point and Print File |
| .WEBPUBLISHHISTORY | Alpha Five Web Publish History File |
| .WEBSITE | Internet Explorer Pinned Site Shortcut |
| .WEBTEMPLATE | iWeb Template |
| .WEBTEST | Visual Studio Web Test File |
| .WEBTHEME | iWeb Theme Template |
| .WEBZ | WEBZ Compressed eBook File |
| .WEM | Wwise Encoded Media File |
| .WER | Windows Error Report |
| .WERD | Werd Ransomware Encrypted File |
| .WFB | WaveFront Sound Bank |
| .WFC | WinFellow Configuration File |
| .WFD | Wayfinder Map File |
| .WFM | Pro Tools Wave Cache File |
| .WFP | Wondershare Filmora Project File |
| .WFSP | Wondershare Fantashow Project |
| .WFT | GTA 4 Car Model File |
| .WFW | Windows Firewall Policy File |
| .WGF | Widelands Game File |
| .WGI | Wildgame Innovations Video File |
| .WGP | Web Gallery Project |
| .WGS | Walk-Graph Segment File |
| .WGT | Opera Widget File |
| .WGZ | S60 Web Runtime Widget Package |
| .WHF | Wing Helper File |
| .WHIRLD | Unity Whirld Package |
| .WHL | Python Wheel Package |
| .WHTT | HTTrack Website Copier File |
| .WI | Wavelet Image |
| .WIC | J Wavelet Image |
| .WID | Visual Studio Widget File |
| .WIDGET | HybridJava Widget |
| .WIE | WordPress Widget Export File |
| .WIF | Weaving Interchange Format File |
| .WII | Scrambled Wii Disc Image |
| .WIL | WinImage Disk Image List |
| .WIM | Windows Imaging Format File |
| .WIN | TWRP Backup |
| .WINCLONE | Winclone Image |
| .WINDOWSLIVECONTACT | Windows Live Contacts File |
| .WINMD | Windows Metadata File |
| .WIQ | Visual Studio Work Item Query File |
| .WIXLIB | WiX Library File |
| .WIXMSP | WiX XML Patch File |
| .WIXMST | WiX Transform File |
| .WIXOBJ | WiX Object File |
| .WIXOUT | WiX XML Output File |
| .WIXPDB | WiX Debug File |
| .WIXPROJ | WiX Project File |
| .WIZ | Microsoft Wizard File |
| .WJE | WinJournal Entry |
| .WJF | WinJournal Journal File |
| .WJR | ReGet Deluxe Data File |
| .WK1 | Lotus Worksheet |
| .WK2 | Lotus 2 Worksheet |
| .WK3 | Lotus 3 Worksheet |
| .WK4 | Lotus 4 Worksheet |
| .WK5 | Lotus 5 Worksheet |
| .WKE | Lotus 1-2-3 Educational Version Worksheet |
| .WKI | Lotus 2 Worksheet |
| .WKQ | Quattro Pro for DOS Spreadsheet File |
| .WKS | Works Spreadsheet |
| .WKU | Lotus 1-2-3 Spreadsheet |
| .WL1 | Wolfenstein 3D Data File |
| .WL6 | Wolfenstein 3D Data File |
| .WLB | WinList Protocol Bundle |
| .WLD | ESRI World File |
| .WLDX | World Map File |
| .WLL | Microsoft Word Add-in File |
| .WLMP | Windows Live Movie Maker Project File |
| .WLP | Worldlabel.com Label Designer File |
| .WLS | R-Link Update File |
| .WLT | Unity Window Layout File |
| .WLU | Jaff Ransomware Encrypted File |
| .WLVS | Windows Movie Maker Video Settings File |
| .WLX | Windows Live Mesh Sync File |
| .WLZ | WinImage Compressed Disk Image Set |
| .WM | Windows Media File |
| .WMA | Windows Media Audio File |
| .WMD | Windows Media Download Package |
| .WMDB | Windows Media Database File |
| .WME | Windows Media Encoder Session File |
| .WMF | Widelands Map File |
| .WMGA | Web Manga Document |
| .WML | Wireless Markup Language File |
| .WMMP | Windows Movie Maker Project File |
| .WMO | World of Warcraft World Map Object |
| .WMP | Windows Media Photo File |
| .WMS | Windows Media Skin |
| .WMT | WinMount Virtual Disk File |
| .WMV | Windows Media Video |
| .WMX | Windows Media Redirector File |
| .WMZ | Windows Media Player Skin Package |
| .WN | WN Web File |
| .WNCRY | Wana Decrypt0r 2.0 Encrypted File |
| .WNK | Wink Presentation |
| .WNRY | WannaCry Virus Encrypted File |
| .WOA | WebObjects Application |
| .WOFF | Web Open Font Format File |
| .WOFF2 | Web Open Font Format 2.0 File |
| .WOLF | Wolf RPG Editor Game Data Archive |
| .WOLFQUEST | WolfQuest Saved Game |
| .WOP | Wonderland Object Preset |
| .WOR | MapInfo Workspace File |
| .WORDLIST | Desktop Poet Word List File |
| .WORK | Bibble Work Queue File |
| .WORKBOOK | Xamarin Workbook File |
| .WORKFLOW | Automator Workflow |
| .WORKSHEET | BBEdit Shell Worksheet File |
| .WORKSPACE | Code::Blocks Workspace File |
| .WORLD | Starbound World File |
| .WOT | Web Of Trust File |
| .WOTMOD | World of Tanks Modification File |
| .WOTREPLAY | World of Tanks Replay File |
| .WOW | SparkMaker 3D Print File |
| .WOWPROJ | AddOn Studio Project File |
| .WOWSL | WOW Slider |
| .WOWSREPLAY | World of Warships Replay File |
| .WOZ | Apple II Disk Image |
| .WP | WordPerfect Document |
| .WP3 | Microsoft Photo Story Project File |
| .WP4 | WordPerfect 4 Document |
| .WP5 | WordPerfect 5 Document |
| .WP6 | WordPerfect 6 Document |
| .WP7 | WordPerfect 7 Document |
| .WPA | ACT! Word Processing Document |
| .WPB | Windows Phone Device Manager Backup File |
| .WPC | Pazzles Cutting File |
| .WPD | ACT! 2 Word Processing Document |
| .WPE | WordPerfect Entrust Document |
| .WPF | WordPerfect Form |
| .WPG | Ironsight Game Data File |
| .WPH | Phoenix BIOS File |
| .WPI | Inkling Sketch Binary File |
| .WPK | WordPerfect Macro |
| .WPL | GTA Binary Item Placement File |
| .WPM | Warcraft 3 Path Map File |
| .WPO | Technopress Waypoint 2D File |
| .WPOST | Windows Live Writer Post File |
| .WPP | WordPerfect Color Palette |
| .WPROJ | Wwise Project File |
| .WPS | Translator's Workbench Project File |
| .WPT | Cube 2 Waypoint File |
| .WPW | WinDev Mobile Window File |
| .WPX | Printer summary File |
| .WQ1 | Quattro Pro for DOS Spreadsheet File |
| .WQ2 | Quattro Pro for DOS Spreadsheet File |
| .WR1 | Lotus Symphony Worksheet File |
| .WRF | WebEx Recording |
| .WRI | Microsoft Write Document |
| .WRK | SQL Server Log Shipping File |
| .WRL | VRML World |
| .WRP | Geomagic 3D Wrap File |
| .WRPL | Widelands Saved Game File |
| .WRPL.WGF | Widelands Initial Saved Game File |
| .WRTS | Wrts File |
| .WRUI | STOP WRUI Ransomware Encrypted File |
| .WRYPT | Panwrypter Depleted Storage Volume File |
| .WRZ | Compressed VRML World File |
| .WS | WonderSwan Game ROM File |
| .WSC | Windows Script Component |
| .WSD | WordStar Document |
| .WSDL | Web Services summary Language File |
| .WSF | Windows Script File |
| .WSH | Windows Script Host Settings |
| .WSI | Wise Package Studio Installer Package |
| .WSM | Wise Package Studio Merge Module |
| .WSP | SharePoint Solution Package |
| .WSPAK | WebsitePanel Backup File |
| .WSVE | Wondershare Filmora for Mac Project File |
| .WSXKEY | Winstep License Key |
| .WSZ | Winamp Classic Skin |
| .WTB | Win-Test Binary Log File |
| .WTC | Logitech Webcam File |
| .WTD | Grand Theft Auto IV Textures File |
| .WTF | World of Warcraft Text File |
| .WTML | WorldWide Telescope Data File |
| .WTPL | WireTap Studio Library |
| .WTPT | WireTap Studio Packaged Track |
| .WTR | Encarta File |
| .WTT | Write! Document |
| .WTV | Windows Recorded TV Show File |
| .WTX | Text Document |
| .WU8 | Wiimm U8 Mario Kart Wii Archive |
| .WUD | Wii U Disk Image File |
| .WUL | WinUHA Language File |
| .WUP | Wii U ROM |
| .WUS | WUTG Tagged Audio File |
| .WUT | WUTG Tag File |
| .WUX | Compressed Wii U Disk Image File |
| .WV | WavPack Audio File |
| .WVC | WavPack Correction File |
| .WVE | Wondershare Filmora Project File |
| .WVL | Wavelet Image |
| .WVM | Google Play Video File |
| .WVP | MagicHTML Web Video Player Project |
| .WVX | Windows Media Video Redirector |
| .WWD | Works Wizard File |
| .WWF | World Wide Fund Non-Printable Document |
| .WWU | Wwise Work Unit |
| .WX | Wanam Xposed Backup File |
| .WXI | WiX Include File |
| .WXL | WiX Localization File |
| .WXN | Waixing Famicom Game ROM |
| .WXP | Wax 2.0 Project |
| .WXS | WiX Source File |
| .WYZ | WYZTracker File |
| .WZ | Warzone 2100 Data File |
| .WZCONFIG | WinZip Configuration File |
| .WZMUL | WinZip Registration File |
