Remove duplicate entries in “Open With…” Popup in Mac OS X (Mountain Lion)

After running Mac OS X for some years I encountered that the “Open With…” popup menu had multiple entries of one program listed, which was kind of annoying. I tried to find solutions for this, but couldn’t find one, until I eventually ask Dr. Google the right question and found a blog post about it. Anyway, all you have to do is to start the and run

LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local\
-domain system -domain user

Then restart the or restart the computer. Worked well with Mountain Lion!

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