Thoughts about setup and deployment issues, WiX, XNA, the .NET Framework and Visual Studio
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herein are my own and not those of my employer, Microsoft.
The Windows Phone Developer Tools 7.1 allows you to create applications and games that target both Windows Phone OS 7.0 and Windows Phone OS 7.1. In some cases, you may want to create separate versions of an application or game that target both versions of the Windows Phone OS and that share common code. There is not a way to automatically create a Visual Studio solution and projects to do that. Here are some manual steps you can use to create XNA Game Studio 4.0 projects that target Windows Phone 7.0 and 7.1 and that share code and content:
You can find a sample solution that I created that I have already completed all of the above steps for at http://cid-27e6a35d1a492af7.skydrive.live.com/self.aspx/Blog_Tools/WPGameMultiTargetingSample.zip.
The above steps will create a solution and a set of projects that behave differently than a traditional multi-platform solution in XNA Game Studio that is created by starting a project for one platform and then creating a copy of it for another platform via the Create Copy of Project menu item in the Visual Studio IDE. Projects created with Create Copy of Project will be automatically synchronized behind the scenes so that if you add, remove or rename a file in one project, it is reflected in the other copies. After completing the above steps, you will need to make sure that you manually synchronize any file add, remove or rename operations. Changing code within files that have already been added to both projects will be picked up when you build either one of the projects though.