What I Found
If OS X Mountain Lion shows duplicate apps in the Open With menu, you can clean it up with a reusable Automator.
If your Mac's Open With menu in OS X Mountain Lion is packed with duplicate app entries, you are not imagining it. In my case, one app update after another kept adding the same applications back into the menu.
The fix is to create a small Automator application that runs an AppleScript cleanup action, then relaunch Finder so the Open With menu refreshes. After that, the duplicate entries should disappear.
What this video covers
- Why The Menu Gets Cluttered
- Create The Automator App
- Relaunch Finder
- Keep The App For Next Time
The short version
The fix is to create a small Automator application that runs an AppleScript cleanup action, then relaunch Finder so the Open With menu refreshes. After that, the duplicate entries should disappear.
