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How can I break a persistent association between .xcodeproj files and Xcode 4.2 beta?

I've got Xcode 4.0.2 installed in /Developer, and the Xcode 4.2 beta in /XcodeBeta. My problem is that the .xcodeproj file type is now associated with Xcode 4.2 and I can't change it to Xcode 4.0.2. ...