How To Change Default Open Application Behavior OS X
To change the default application OS X opens with when you double click a file.
1. Click once on the file (highlight) in Finder
2. Choose File -> Get Info (or Apple+I)
3. Select the application you want to open that file under “Open with”
4. Click on (Change All) button to apply this globally

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by preet
on 23. Aug, 2009