To get started, close all open applications and then launch Terminal from Macintosh HD > Applications > Utilities. Our test system is running OS X Mavericks 10.9.1, but these instructions work with OS X Lion and OS X Mountain Lion as well.
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. To fix this, we need to reset OS X’s LaunchServices database. We migrated our data by cloning the iMac’s drive to the Mac Pro’s, which worked fine except we had duplicate entries of all of our applications in the Open With menu. Something similar happened when we moved our TekRevue production Mac from an iMac to a Mac Pro. Users who have upgraded their apps over time might find old versions referenced in the list, and those who migrate their OS X installation to a new drive could see duplicate entries. However, the Open With menu can sometimes get out of control. A great example is setting OS X to open image files with Preview by default, but using the Open With menu to open the image with Photoshop for editing tasks. This lets users keep a default application for viewing most files, but still have quick access to another compatible application when needed. While most files in OS X are configured to open with a specific application by default, users have the option to use a handy “Open With” menu, found by right-clicking (or Control-clicking) on a file. Rebuild LaunchServices to Fix Duplicate Entries in OS X's 'Open With' Menu
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