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Cleaning up duplicate or old entries in the ‘Open With…” context menu on OS X.
Run Terminal, and execute this command.
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/ LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
Then, relaunch Finder. All done. This has been tested on MacBook Pro (Mountain Lion).
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