Changing which Application Launches when a File is Clicked on.

My MP3's were taking forever to open with Rythembox so I changed the default application that opened MP3s when I click on them.  Here's how;

1.  Launch Nautilus and right click on the file with the file-type or extension you want to change.

2.  Choose Properties from the context menu (The Right Click Menu).

3.  Click on the Open With tab.

4.  Select the desired Application you want to open the given file-type with.

5.  Click on the Set As Default button

6.  Done