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Fix Duplicate Entries in Mac OS “Open With” Menu

I don’t know why this happens, but everytime after a few weeks of using my Mac I always end up having multiple entries of the same programs in my “Open With” menu. It must be some kind of bug, probably relating to software updates or Time Machine backups.

The “Open With” menu can be rebuilt by issuing the following command:

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

After that the Finder has to be restarted (alt+cmd+esc) and then the menu should be fine again.

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