Thank you. Just for reference, the pywinrt project workarounds the absence of that header file in this https://github.com/pywinrt/pywinrt/commit/1c7d7118b3025c14e33fc7d01b8afa30c2... commit. Though adding this header file results the following compiler error, it seems related to that project.
``` cppwinrt/winrt/base.h:676:27: error: constexpr variable 'guid_v<IGraphicsCaptureItemInterop>' must be initialized by a constant expression ```