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Desktop app registry and program files access under Vista and Windows7

I'm writing a desktop application in C# that must run under XP, Vista, and Windows7. Under XP the application can write to the registry and save file to an application subfolder in program files, e.g. "c:\program files\MyApp\DataFolder". When run under VIsta and Windows7 I get a popup dialog that it can't save files to the "c:\program files\MyApp\DataFolder", because of permissions, would I like to use my documents instead. Additionally code that writes to the registry under XP will not work under Vista/Windows7. What must I do to insure my app has the correct permissions to be able to perform these actions? This is a simple desktop application that the user installs using an installer built along with the project using VS2008.

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Waseems

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John

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rgstephens

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Waseems: Thanks you gave me some ideas to think about. I was hoping to be able to set permission automatically without the end user having to run it in compatiblity mode. I was thinking of storing the data in the user's folder.
thinkpads_user: I appreciate your clarification of the "My Documents" changing to the users folder.
I'll research "User Acccount Control" further on the web. Thanks.