| Extension | File Type | Files scanned | Contributor |
| W2M | Solo Explorer Transcription | 8 | |
| W3D | Shockwave 3D Scene Export | 12 | |
| W3G | WarCraft III Recorded Game File | 3 | .Cryorb |
| W3M | WarCraft III map | 124 | .Cryorb |
| W3Z | WarCraft III Saved Game File | 13 | .Cryorb |
| W64 | Sonic Foundry Wave-64 audio | 13 | |
| WAB | Outlook Express addressbook | 5 | |
| WAD | WAD3 game data | 7 | |
| WAD | id Software's DOOM Internal-WAD | 2 | |
| WAD | id Software's DOOM Patch-WAD | 65 | |
| WAL | Black and White 2 Wall data | 9 | |
| WAL | WinAmp 3.x Skin | 34 | |
| WAR | Java Web Archive | 14 | |
| WAV | Broadcast Wave File audio | 15 | |
| WAV | ECHOSPEECH encoded audio | 15 | |
| WAV | RIFF/WAVe Audio (edited with Sound Forge) | 29 | |
| WAV | RIFF/WAVe standard Audio | 64 | |
| WB1 | Webshots Image | 262 | Joao Paulo Barraca |
| WB1/WB2 | Quattro Pro spreadsheet | 35 | |
| WB3 | Quattro Pro 7 spreadsheet | 19 | |
| WBA | WindowBlinds skin-theme | 12 | |
| WBA | WindowsBlinds Progress Anim theme | 16 | |
| WBD | WinBreadboard circuit schematic | 9 | Marcos F |
| WBD | eBeam Whiteboard | 13 | |
| WBZ | WebShots Image | 8 | |
| WCM | Corel WordPerfect Macro | 9 | |
| WCX | FAR TC.Packer PlugIn | 9 | |
| WCX | Total Commander Packer extension (plugin) | 22 | |
| WCZ | Chamaleon Clock wallpaper clock skin | 7 | |
| WDB | Microsoft Works Database | 29 | |
| WDE | WinDev Report | 121 | |
| WDF | WinGenea Data File | 2 | |
| WDG | WinDev Procedures' Set | 56 | |
| WDI | WinDev Component description | 14 | |
| WDK | WinDev Component | 46 | |
| WDL | DynaDoc Electric Exchange Document | 33 | |
| WDP | WinDev Project | 55 | |
| WDPROJ | Visual Studio Web Deployment Project | 10 | |
| WDR | Psion Serie 3/3a printer driver | 11 | |
| WDS | 3D WohnungsPlan project | 4 | |
| WDW | WinDev Window | 625 | |
| WDX | Total Commander Content plugin | 6 | |
| WDY | WinDev Run-Time Template | 47 | |
| WDZ | WINDEV compressed archive | 21 | |
| WEA | WeatherTool weather data | 4 | |
| WEAP | Weapon definition script | 2 | |
| WEB | BlackWidow Website Description | 10 | |
| WEB | Corel Xara Web document | 11 | |
| WEBARCHIVE | Apple Safari WebArchive | 28 | |
| WEBLOC | Apple Finder Internet Location | 4 | |
| WEBTEST | Fiddler saved WebTest | 6 | |
| WED | Infinity Engine region/map (v1.x) | 9 | |
| WF1 | EViews Workfile | 8 | |
| WFM | Tektronik waveform data | 3 | |
| WFX | Total Commander File system extension (plugin) | 12 | |
| WGP | WingMan profile | 19 | |
| WIC | J Wavelet Image Codec bitmap | 21 | |
| WIDGET | Konfabulator widget | 13 | |
| WIDGET | Yahoo! Widget | 30 | |
| WIM | Windows Imaging Format | 3 | |
| WIX | Xara graphics | 6 | |
| WJF | WinZip Job File | 11 | |
| WK* | Lotus 123 Worksheet (generic) | 18 | |
| WK1 | Lotus 123 Worksheet (V2) | 11 | |
| WK3 | Lotus 123 Worksheet (V3) | 5 | |
| WK4 | Lotus 123 Worksheet (V4) | 22 | |
| WKF | VISI-serie CAD/CAM work file | 12 | |
| WKS | DeskMate worksheet | 23 | |
| WKS | Microsoft Works spreadsheet | 19 | |
| WKZ | Wingz spreadsheet | 42 | |
| WLK | WeatherLink Binary Weather data | 3 | |
| WLM | CompW bitmap | 21 | |
| WLS | 602Tab Workbook | 16 | |
| WLX | Total Commander Lister extension (plugin) | 9 | |
| WM/WM2D | Working Model 2D data | 12 | |
| WM3 | MSC.visualNastran Desktop Document | 71 | TBeu |
| WMA | Windows Media Audio | 18 | |
| WMD | Windows Media Download package | 4 | |
| WMF | Windows Metafile | 92 | |
| WMF | Windows Metafile (old Win 3.x format) | 5 | |
| WML | Wireless Markup Language | 3 | |
| WMP | Infinity Engine world map (v1.0) | 2 | |
| WMV | Windows Media Video | 82 | |
| WMZ | Windows Media Player skin | 58 | |
| WN | Wanton Packer song/module | 2 | |
| WNK | Wink presentation | 3 | |
| WOR | MapInfo Workspace | 7 | Rizla99 |
| WP | WordPerfect 4.2 document | 12 | Philip Storry |
| WP | WordPerfect 5.0 document | 12 | Philip Storry |
| WP | WordPerfect 5.1/5.2 Far East version document | 12 | Philip Storry |
| WP | WordPerfect 5.1/5.2 document | 5 | Philip Storry |
| WP/WPD | WordPerfect (generic) | 16 | |
| WPD | 602Text Document | 12 | |
| WPD | SoftKey WinWorks Document | 5 | |
| WPD | WordPerfect 6 and higher document | 45 | Philip Storry |
| WPG | WordPerfect bitmap | 22 | |
| WPG | WordPerfect graphics | 13 | |
| WPL | Windows Media Player playlist | 16 | |
| WPS | Kingsoft WPS Office 2001 document | 8 | |
| WPS | Kingsoft WPS Office 2002 document | 22 | |
| WPS | Microsoft Works text document | 65 | |
| WPS | Microsoft Works text document (alternate) | 12 | |
| WPT | 602PC Suite Template Document | 53 | |
| WPT | Fugawi 3 waypoint format | 13 | |
| WPT | Garmin PCX5 waypoint file | 24 | |
| WRD | Psion serie 3 word document | 5 | |
| WRF | WebEx Recording | 10 | Hasan Ates |
| WRI | Windows Write Document | 126 | |
| WRK | Cakewalk Music project | 18 | |
| WRL | Virtual Reality Modeling Language | 69 | |
| WS | IBM iSeries Client Access WorkStation profile | 18 | |
| WSDL | Web Services Description Language | 9 | |
| WSE | Wise script | 12 | |
| WSF | Windows Script File | 10 | |
| WSP | Whisper 32 data | 2 | |
| WSQ | Wavelet Scalar Quantization bitmap | 9 | |
| WSZ | WinAmp 2.x Skin | 28 | |
| WTL | Windows Test Technologies (WTT) logger results | 6 | |
| WV | Sonarc compressed WAV audio | 90 | |
| WV | WavPack compressed audio | 82 | |
| WVC | WavPack compressed audio correction data | 38 | |
| WVE | Psion Series 3a/3c/3mx audio | 22 | |
| WVF | Yokogawa waveform data | 4 | |
| WVX | Windows Media redirector / shortcut | 7 | |
| WVZ | MUST music / song | 8 | |
| WYG | WYSIWYG project data | 6 | |
| WZD | Sharp Wizard data (generic) | 32 | |
| WZD | Sharp Wizard memo | 17 | |
| WZD | Sharp Wizard program | 10 | |
| WZD | Sharp Wizard schedule | 5 | |
