| W | Word chart file (APPLAUSE) |
| W30 | Printer font (AST TurboLaser) |
| W30 | Printer font (Ventura Publisher) |
| W31 | Startup file (Microsoft Windows 3.1) |
| W3L | W3Launch file |
| W44 | Temporary file for Sort or Index (dBase) |
| WAB | Outlook file (Microsoft Outlook, Outlook Express) |
| WAD | Large file for Doom game containing video, player level, and other information |
| WAL | Texture file (Quake 2) |
| WAS | Script source code file (Procomm Plus Aspect) |
| WAV | Waveform sound (Microsoft Windows) |
| WAX | Compiled script file (Procomm Plus Aspect) |
| WB1 | Notebook (QuattroPro for Windows) |
| WB2 | Spreadsheet (QuattroPro for Windows) |
| WB3 | Text file (QuattroPro for Windows) |
| WBC | Image file (Webshots) |
| WBF | Batch file (Microsoft Windows 9.x) |
| WBK | Backup file (Microsoft Word for Windows) |
| WBL | Upload file (Argo Webload II) |
| WBR | WordBar File (Crick Software) |
| WBT | Batch file (WinBatch) |
| WBT | Wordbar template (Crick Software) |
| WCD | Macro token list file (Microsoft WordPerfect for Windows) |
| WCM | Macro (Microsoft WordPerfect fdor Windows) |
| WCM | Data transmission file (Microsoft Works) |
| WCP | Product information description file (Microsoft WordPerfect for Windows) |
| WD2 | Database file (Info Select) by (Micro Logic) |
| WDB | Database file (Microsoft Works) |
| WDF | WebArt data file (database file that can be converted for use in many programs) |
| WDG | Warftpd remote daemon file |
| WEB | Web document (Corel Zara) |
| WEB | Web source code file |
| WFB | Bank file (Maui/Rio/Monterey) (Turtle Beack WaveFront) |
| WFD | Drum set (Maui/Rio/Monterey)(Turtle Beach WaveFront) |
| WFD | Audio waveform (WaveForm Manager Pro) |
| WFL | Flowchart file (Winflow) |
| WFM | Windows form (Virtual dBase) |
| WFN | Symbol (Corel Draw) |
| WFP | Program file (Turtle Beach WaveFront)(Maui/Rio/Monterey) |
| WFT | Data file (NICOLET (Old Format), see NRF) |
| WFX | Data file (WinFax) |
| WG1 | Worksheet (Lotus 1-2-3/G) |
| WG2 | Worksheet (Lotus 1-2-3 for O/S2) |
| WGP | Data file (Wild Board Games) |
| WI | Wavelet compressed bitmap (Corel) |
| WID | Width table (Ventura Publisher) |
| WIF | Wavelet image file (see WI) |
| WIL | WinImage file |
| WIM | Wireless identity module (Used by wireless application protocols) |
| WIN | Window file (Microsoft FoxPro) |
| WIN | Window file (dBase) |
| WIN | Window preference file (Pro/Engineer) |
| WIS | Script file (Reynolds & Reynolds) (Stores the results of a database query) |
| WIZ | Wizard file (Microsoft Word) |
| WIZ | Page wizard (Microsoft Publisher) |
| WK1 | Spreadsheet (Lotus 1-2-3 v. 1 and 2) |
| WK3 | Spreadsheet (Lotus 1-2-3 v. 3) |
| WK4 | Spreadsheet (Lotus 1-2-3 v. 4) |
| WKB | Document file (Microsoft WordPerfect for Windows) |
| WKE | Spreadsheet (Lotus 1-2-3 Educational version) |
| WKQ | Spreadsheet (Quattro Pro) |
| WKS | Spreadsheet (Symphony 1.0) |
| WKS | Worksheet spreadsheet (Lotus 1-2-3) |
| WKS | Document (Microsoft Works) |
| WKS | Workspace file (Xlisp) |
| WLD | REND386/AVRIL file |
| WLF | Upload file (Argo Upload I) |
| WLK | Graphics file (Virtus Walkthrough) |
| WLL | Add-In file (Microsoft) |
| WMA | Audio file in Microsoft Windows Media format (Can be changed to ASF) Siren (Sonic Foundry) |
| WMC | Backup files for startup (MathCAD for Windows) |
| WMC | Macro file (Microsoft WordPerfect for Windows) |
| WMC | Text file (WordMARC) |
| WMF | Metafile (Microsoft Windows) |
| WN | Text file (NeXT WriteNow) |
| WNF | Outline font description file (CorelDRAW) |
| WOA | Swap file (Microsoft Windows 3.x) |
| WOC | Organization chart (Microsoft Windows OrgChart) |
| WOW | Music module (MOD) (Grave Composer) |
| WP | Document file (Microsoft WordPerfect for Windows) |
| WPA | Word processor document (ACT!) |
| WP4 | Document (Microsoft WordPerfect for Windows 4.0) |
| WP5 | Document (Microsoft WordPerfect for Windows 5.0) |
| WP6 | Document (Microsoft WordPerfect for Windows 6.0) |
| WPD | Demo file (Microsoft WordPerfect for Windows) (ALL) |
| WPD | Document (Microsoft WordPerfect for Windows) |
| WPF | Document (Enable) |
| WPF | Fax document (WorldPort) |
| WPF | Form file (Microsoft WordPerfect for Windows) |
| WPG | Microsoft Word for Windows vector graphics (DrawPerfect) |
| WPG | Graphics file (Microsoft Word for Windows) |
| WPK | Macro (Microsoft Word for Windows) |
| WPM | Macro (Microsoft Word for Windows) |
| WPS | Text document (Microsoft Works) |
| WPT | Template (Microsoft Word for Windows) |
| WPW | PerfectWorks document (Novell) |
| WQ! | Compressed spreadsheet (QuattroPro) |
| WQ1 | Spreadsheet (QuattroPro/DOS) |
| WQ2 | Spreadsheet (QuattroPro version 5) |
| WR1 | Symphony file (Lotus) |
| WR1 | Spreadsheet (Symphony 1.1-2) |
| WRD | Template (Charisma) |
| WRG | ReGet document |
| WRI | Write document (Windows Write) |
| WRK | Project file (CakeWalk Music Audio) |
| WRK | Spreadsheet (Symphony 1.0) |
| WRL | Virtual Reality model |
| WRP | Compressed Amiga archive (WARP) |
| WRP | 3D modeling file (Raindrop Geomagic) (Scandata) |
| WRS | Resource file (Microsoft Word for Windows) |
| WRZ | Another VRML fileject |
| WS | Text file (WordStar) |
| WS1 | Document (WordStar for Windows version 1) |
| WS2 | Document (WordStar for Windows version 2) |
| WS3 | Document (WordStar for Windows version 3) |
| WS4 | Document (WordStar for Windows version 4) |
| WS5 | Document (WordStar for Windows version 5) |
| WS6 | Document (WordStar for Windows version 6) |
| WS7 | Document (WordStar for Windows version 7) |
| WSD | Document (WordStar for Windows 2000) |
| WSP | WorkSpace file (Fortran PowerStation) |
| WST | Document (WordStar for Windows) |
| WSZ | Skin (WinAmp) |
| WTA | Used by wireless telephony applications |
| WVL | Wavelet Compressed Bitmap |
| WVW | Interleaf WorldView format (a PDF format) |
| WWB | Button bar for document window (Microsoft WordPerfect for Windows) |
| WWK | Keyboard layout file (Microsoft WordPerfect for Windows) |
| WWL | Add-in file (Microsoft Word) |
| WXB | Backup document file (EXP: The Scientific Word Processor |
| WXD | Music resource file (Relic Entertainment)(Home World) |
| WXP | Document file (EXP: The Scientific Word Processor) |
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Le Havre