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Today I noticed that when I right-clicked on an image and selected “Open With” from the contextual menu – it took a while (a few seconds to open) and that it contained duplicated entries of several of my applications.
It seems that it is a known issue – and the fix is pretty straight forward.
Open up your Terminal and enter the following code:
cd /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/ ./lsregister -kill -domain local -domain system -domain user
Once the above has been executed (can take a bit, just wait for the prompt to show up again) then exit your Terminal and log out of your Mac and log back in and then it should be resolved.
The problem in my case seems to be caused by the fact that I had a mounted disk with a clone of my main disk on – so all “open with” applications where duplicated as they existed two places. I have solved the problem by not keeping the clone mounted – and simply leave the mounting to SuperDuper that I use for my cloning (after the backup SuperDuper automatically un-mount the disk).
