Why does "Open With" display so many instances of an app? When I select a file and right click on it to use the "Open With" option I see a list of the most likely applications for opening that file, but in my case, running 10.9.5, I see three and sometimes four instances of each recommended application for opening that particular file - see attached screenshot. Why is this? Is there a way to reduce that to one instance per app? If so, how?
Rebuild LaunchServices to Fix Duplicate Entries in OS X’s ‘Open With’ Menu


  To fix this, we need to reset OS X’s LaunchServices database. As is the case with most actions in OS X, there are multiple ways to accomplish this task, but the fastest is to simply use a Terminal command.


From that article- Copy following in to your Terminal

/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user