If the “Open with” menu on your Mac OS X Finder menu shows duplicate or multiple entries for the same application, open a terminal and type in the following:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
Then restart finder by clicking on the “Relaunch” menu which appears when you right click on the Finder icon in the dock while holding your option key.
