How can I force to use specific version of Xcode or opening project/workspace file?

I installed Xcode 4.2 beta side-by-side, and now all project/workspace files are linked to newer version of Xcode. So beta Xcode opens when I click the project file by double-clicking in Finder. I tried to change it from Finder inspector tool, but it didn't work. How can I force to use older version of Xcode w开发者_运维技巧hen opening file in Finder?

Put both XCodes in your Dock and drag to the one you want used. Use a custom icon if you want to get real fancy.