A useful howto on removing excessive entries in Finder’s Open With menu. If you, like me, have been beta-testing several versions of the same software on OS X, chances are that when you right-click on a file, you will end up with having a ‘Open With’ menu fills with many duplicate entries of the same application. This menu list is supposed to be updated automatically by OS X itself, however, it seems that it doesn’t update it as often.
A simple and yet effective way or resetting the is as follows:
1. Go to the Preference folder located inside the Library folder in your home directory (i.e. *yourusername*/Home/Library/Preferences/)
2. Locate the file named com.apple.LaunchServices and delete it
After that you could relaunch the Finder and the Open With menu should no longer contain any duplicate entry.