Friends often send me emails with all kinds of stuff that is in MP4 format that I cannot open. I have Windows media player and VLC installed. Shouldn't I be able to open these files automatically while still in my Google email?
Windows Media Player does not support mp4 format by default. You need to install an additional DirectShow-compatible MPEG-4 decoder pack to be able to play mp4 in Windows Media Player.
Expand mp4 video file on this Microsoft site to get information on where to get this from:
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