[ubuntu] Setting Banshee as default

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http://ubuntuforums.org – I have installed Banshee and set it as the default sound player in Details/Default Applications/Music. However, when I click on any MP3 file, it opens with Rhythmbox. If I right click on it, I can select and play it with Banshee but it is not the default. How can I fix this without removing Rhythmbox completely. (Hardware)