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How to change default application for certain file type in Mac OS X

From: LinuxQuestions.org

Click on the file once, hit Command I (”Apple key” and ‘i’). Near the bottom of that screen that pops up will be a section titled “Open With”. If you don’t see any details, click the tiny triangle next to it so that the section expands. You can click the name of the default application and choose “other” from the drop-down list, then search for the app you want to use. Finally, click the Change All button right below the name of the new application on the Info screen.

BTW do all this from a Finder window. Don’t try to do it from inside an application.