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Windows にもガイドラインはありますよ。
[MSDN Library]-[Win32 and COM Development]-[Technical Articles]-[User Interface]-[User Interface Design and Usability]-[Microsoft Inductive User Interface Guidelines] [microsoft.com]とか
[MSDN Library]-[.NET Development]-[Articles and Overviews]-[Windows Vista]-[Windows Vista User Experience Guidelines] [microsoft.com]など。