How do I open project version 1.0 with xcode 4.2?
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I downloaded this Xcode project(version 1.0 as in `contents.xcworkspacedata`) from [here][1]


When I try to open it, got this error:

    Failed to load project at '.../Lesson31_OSXCocoa/Lesson31_OSXCocoa.pbproj', incompatible project version.

How do I open project version 1.0 with xcode 4.2?

  [1]: http://nehe.gamedev.net/data/lessons/macosxcocoa/lesson31.zip