The following posts for OS X 10.7 and 10.8 are still working for the new OS X 10.9 (aka Maverick) and will help you get a clean "Open With" menu:
- Open Terminal (Applications / Utilities / Terminal.app)
- Type in the following command : /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user
- Wait for that command to complete and if no error then proceed to the last step: restarting Finder
- Restarting Finder does not require you to reboot your Mac. Simply press Control + Option while clicking on the Finder icon in the Dock, select Relaunch and you are set!
|OS X Maverick with duplicates in "Open With" menu||Clean "Open With" menu|