| .WAV | Microsoft Corporation | 音頻檔案 | WAVE Audio File | Microsoft Windows Media Player | Microsoft Corporation |
| .WAX | Microsoft Corporation | 音頻檔案 | Windows Media Audio Redirect | Microsoft Windows Media Player | Microsoft Corporation |
| .WDF | Workshare | 資料檔案 | Workshare Compare DeltaFile | Microsoft Windows Media Player | Microsoft Corporation |
| .WEBM | Google | 視頻檔案 | WebM Video File | Microsoft Windows Media Player | Microsoft Corporation |
| .WM | Microsoft Corporation | 視頻檔案 | Windows Media File | Microsoft Windows Media Player | Microsoft Corporation |
| .WMA | Microsoft Corporation | 音頻檔案 | Windows Media Audio File | Microsoft Windows Media Player | Microsoft Corporation |
| .WMD | Microsoft Corporation | 視頻檔案 | Windows Media Download Package | Microsoft Windows Media Player | Microsoft Corporation |
| .WMDB | Microsoft Corporation | 資料庫檔案 | Windows Media Database File | Microsoft Windows Media Player | Microsoft Corporation |
| .WMS | Microsoft Corporation | 設置檔案 | Windows Media Skin | Microsoft Windows Media Player | Microsoft Corporation |
| .WMV | Microsoft Corporation | 視頻檔案 | Windows Media Video File | Microsoft Windows Media Player | Microsoft Corporation |
| .WMZ | Microsoft Corporation | 設置檔案 | Compressed Windows Media Player Skin | Microsoft Windows Media Player | Microsoft Corporation |
| .WPL | Microsoft Corporation | 視頻檔案 | Windows Media Player Playlist | Microsoft Windows Media Player | Microsoft Corporation |
| .WVX | Microsoft Corporation | 視頻檔案 | Windows Media Video Redirector | Microsoft Windows Media Player | Microsoft Corporation |
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