What's New in the Windows SDK
The Windows SDK for Windows 7 and the .NET Framework 4 (later referred to as the Windows SDK) introduces new and updated features for Windows 7 and .NET Framework 4, and removes some features that were in the earlier version. For a list of new API features in Windows 7, see What’s New in the Windows API.
Smaller. At less than 600MB, this version of the SDK is only about a third of the size of the Windows 7 RTM SDK. Therefore, it installs faster and has a smaller system footprint.
More organized Setup. Options are grouped into Windows Development, Managed, and Common categories to help you find the components you want.
New Microsoft Help Viewer. This new Help system was introduced with Visual Studio 2010. By using the Help Library Manager, you can download only the content you want from the MSDN website, when you want it.
Enhanced Visual C++ compilers. The included Visual C++ 2010 compilers and C Runtime (CRT), which have improved performance and speed, are the same compilers and tools that are included with Visual Studio 2010.
New build environment. A new command-line build environment uses MSBuild 4.0, which is now the common Microsoft build system for all languages. This environment supports the new Visual C++ project type, .vcxproj.
The following items were either changed or removed from this version of the Windows SDK.
The DExplore document viewer and the MSDN documentation that was included in earlier versions of the Windows SDK are no longer included. At the end of SDK Setup, you have the option to download MSDN documentation to the computer by using the Help Library Manager. For more information, see Help Library Manager. For information about how to install and uninstall Help, see Overview of the Windows SDK.
Managed samples have been moved to the Code Gallery website.
The UI Spy tool (UISpy.exe) and the .NET Compact Framework are not included in this release. Versions of the .NET Compact Framework can be downloaded from the .NET Framework Developer Center website.