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How to omit apps from external drives in “Open With” menu?

in finder's open with menu are a lot of dups. I am running latest OX X and patches.

see screenshot

I googled and found this command, which didn't help

sudo /System/Library/Frameworks/CoreServices.framework/Versions/Current/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user

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