he project aims to provide metadata for Win32 APIs.

Most developers will not consume the metadata directly and will instead use language projections that themselves consume the metadata and project the APIs into the idiomatic patterns of the languages.

I suggest you could refer to the link: https://github.com/microsoft/win32metadata/blob/main/docs/faq.md

If you want to get Win32 headers, I suggest you should use `Windows SDK` instead of `win32metadata`.