Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I looked at


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!

share|improve this question
HKEY_CLASSES_ROOT\SystemFileAssociations holds these values – M.Bennett Dec 9 '13 at 13:04
up vote 1 down vote accepted

check here HKEY_CLASSES_ROOT.mp4\OpenWithProgids

share|improve this answer
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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.