| Endung | Registry-Eintrag | Anwendung (Standard) |
| .wab | wab_auto_datei | |
| .wav | soundrec | |
| .wax | audio | MICROSOFT Mediaplayer |
| .wb2 | QuattroPro.Graph.6 | |
| .wbk | Word.Backup.8 | MICROSOFT Word |
| .wcs | wcsdatei | |
| .WEB | WEB_auto_datei | |
| .webpnp | datei | |
| .WHT | Whiteboard | |
| .wir | WordPad.exe | MICROSOFT Word |
| .wiz | Word.Wizard.8 | MICROSOFT Word |
| .wizhtml | accessthmltemplate | MICROSOFT Access |
| .wk4 | 123Worksheet | |
| .wll | Word.Addin.8 | MICROSOFT Word |
| .wm | video wmplayer.exe | MICROSOFT Mediaplayer |
| .wma | audio Wmplayer.exe | MICROSOFT Mediaplayer |
| .wmd | application/x-ms-wmd wmplayer.exe | MICROSOFT Mediaplayer |
| .wmf | image | MICROSOFT Internet Explorer |
| .wml | wmldatei | |
| .wmls | wmldatei | |
| .wmp | video/x-ms-wmp wmplayer.exe | |
| .wms | application/x-ms-wms wmplayer.exe | MICROSOFT Mediaplayer |
| .wmv | video wmplayer.exe | MICROSOFT Mediaplayer |
| .wmx | video wmplayer.exe | MICROSOFT Mediaplayer |
| .wmz | compressed .exe | |
| .wpd | WPERFECT Win6.1datei | Word Perfect |
| .wpg | Wperfect Draw30.Chart | Word Perfect |
| .wsc | scriptletdatei | |
| .WSF | WSFdatei | |
| .WSH | WSHdatei | |
| .wsz | compressed | |
| .wtx | txtdatei | MICROSOFT Notepad |
| .wvx | video wmplayer.exe | MICROSOFT Mediaplayer |
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