| Extension | Description | File Type |
|---|
| w | Database AppBuilder Source Code File | Developer Files |
| w02 | Multiple Archive File | Data Files |
| w3g | Warcraft 3 Replay Files | Game Files |
| w3m | Warcraft 3 Map File | Game Files |
| w3x | Warcraft 3 Map File | Game Files |
| wad | Compressed Doom Game File | Game Files |
| wal | Winamp Skin File | Misc Files |
| war | Konqueror Archived HTML File | Web Files |
| wav | Waveform Audio File Format | Audio Files |
| wax | Windows Media Player Redirect File | Audio Files |
| wba | WindowBlinds Skin File | Misc Files |
| wbfs | Wii Backup File System File | Game Files |
| wbmp | Wireless Application Protocol Bitmap File | Graphic Files |
| wdb | Microsoft Works Database File | Misc Files |
| webarchive | Safari Web Archive | Web Files |
| webloc | Safari Webloc File | Web Files |
| webm | WeM Container File | Video Files |
| webp | WebP image File | Graphic Files |
| website | IE9 Pinned Website File | Web Files |
| wem | Margonem Maps | Game Files |
| wer | Microsoft Windows Error Report File | System Files |
| wfc | Windows Wireless Network Settings File | Settings Files |
| wft | Nicolet WFT Export File | Data Files |
| wfw | WFW File | Backup Files |
| wgt | Opera Widget File | Misc Files |
| widget | Yahoo Widget File | Executable Files |
| wim | Image Format File | Disk Image Files |
| win | Opera Saved Window File | Web Files |
| windowslivecontact | Windows Live Contact File | Misc Files |
| wlmp | Live Movie Maker Project File | Data Files |
| wma | Windows Media Audio | Audio Files |
| wmdb | Windows Media Database File | Data Files |
| wmf | Windows Metafile File | Graphic Files |
| wml | Wireless Markup Language | Web Files |
| wmv | Windows Media Video | Video Files |
| woc | Microsoft Office 2007 Organization File | Data Files |
| woc | Widows Orgchart Organization Chart File | Data Files |
| wotreplay | World Of Tanks Playback File | Game Files |
| wp3 | Microsoft Photo Story Project File | Multimedia Files |
| wpd | Word Perfect Document | Text Files |
| wpl | Windows Media Player Playlist File | Video Files |
| wpostx | wpostx | Web Files |
| wps | Microsoft Works Document File | Document Files |
| wri | Windows Write Document | Text Files |
| wrl | Virtual Reality Modeling Language World File | 3D Files |
| wses | WinSesame Encrypted File | Encrypted Files |
| wsz | Winamp Compressed Skin File | Archived Files |
| wtc | Watertec Database | Data Files |
| wtd | WinTune Document File | Misc Files |
| wtf | World of Warcraft Text File | Game Files |
| wv | WavPack compressed Audio File | Audio Files |