Unable to play any movie files with latest Windows Update

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A very quick solution / workaround which may solve things:

  • Settings > File Types.
  • Double-click Movies under File Type Groups (or do each individual movie types under System File Types, if you prefer).
  • Select the Events tab and double-click the Left double-click event.
  • Paste FileType ACTION=shellex as the command.

The issue with the Open With menu not working correctly may be the return of this Windows 10 problem:

That post has a solution which worked for me. (Change .png to the extension you're interested in, of course, and change pngfile to what the assoc command reports for the extension.) But it's also possible it is a different issue.

Let us know if neither option solves things and we can diagnose what's going on further.

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