Fix duplicate programs in Finder’s “Open With” list

Right Click, Open With... has lots of duplicates!

Right Click, Open With… has lots of duplicates!

Every once in awhile, Mac OS X seems to lose it’s way with regard to the apps it shows when you right click on a file, and choose “Open With.” For some reason, this is particularly pronounced in Mountain Lion (Apple’s buggiest OS to date).

Here’s how to fix the problem:

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