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No modifications need to be made to the Lesson 15 project files for them to work in Flash CS5.5.
However, since the release of ActionScript 3.0 for Adobe Flash Professional CS5 Classroom in a Book, Adobe has made a number of major announcements regarding the future of Flash and 3D. The most significant of these is the announcement about a new 3D technology code-named Molehill, which will be included in forthcoming versions of the Flash Player.