VS_IOT_EXTENSIONS_VERSION
Visual Studio Windows 10 IoT Extensions Version
Specifies the version of the IoT Extensions that should be included in the target. For example 10.0.10240.0. If the value is not specified, the IoT Extensions will not be included. To use the same version of the extensions as the Windows 10 SDK that is being used, you can use the CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION variable.
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https://cmake.org/cmake/help/v3.5/prop_tgt/VS_IOT_EXTENSIONS_VERSION.html