New in version 3.4.
Visual Studio Windows Target Platform Version.
When targeting Windows 10 and above Visual Studio 2015 and above support specification of a target Windows version to select a corresponding SDK. The CMAKE_SYSTEM_VERSION variable may be set to specify a version. Otherwise CMake computes a default version based on the Windows SDK versions available. The chosen Windows target version number is provided in CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION. If no Windows 10 SDK is available this value will be empty.
One may set a CMAKE_WINDOWS_KITS_10_DIR environment variable to an absolute path to tell CMake to look for Windows 10 SDKs in a custom location. The specified directory is expected to contain Include/10.0.* directories.
See also CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION_MAXIMUM.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION.html