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Microsoft Windows SDK, and its predecessors Platform SDK, and .NET Framework SDK, are software development kits (SDKs) from Microsoft that contain documentation, header files, libraries, samples and tools required to develop applications for Microsoft Windows and .NET Framework. "Platform SDK" specializes in developing applications for Windows 2000, XP and Windows Server 2003. ".NET Framework SDK" is dedicated to developing applications for .NET Framework 1.1 and .NET Framework 2.0. "Windows SDK" is the successor of the two and supports developing applications for Windows XP and later, as well as .NET Framework 3.0 and later.