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I looked at

HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.extension\OpenWithList 

and only the a key is there, not the six programs in the menu for a file with the .mp4 extension. How can I remove them? Thank you!

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HKEY_CLASSES_ROOT\SystemFileAssociations holds these values –  M.Bennett Dec 9 '13 at 13:04

1 Answer 1

up vote 1 down vote accepted

check here HKEY_CLASSES_ROOT.mp4\OpenWithProgids

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That works, but how do I tell which 'metro' apps are which? –  GiantDuck Dec 9 '13 at 13:21
    
Nevermind, I just renamed them and saw what disappeared from the menu. Thanks! –  GiantDuck Dec 9 '13 at 13:28

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