How to play MP4 files in Windows 10 - Microsoft Support
https://support.microsoft.com/en-us/windows/how-to-play-mp4-files-in-windows-10-e0c8d4ae-84bf-85d6-2e0c-686a80f54207
WebOn a PC running Windows 10, select Start > File Explorer, or select File Explorer from the taskbar. Press and hold (or right-click) the MP4 file you want to play, select Open with , and then choose your preferred file player from the list of applications.
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