IIRC there is very little that is Windows-only. .Net Core was much more Windows-oriented. The things that are Windows-only are like that because they are not available in other platforms, like for example WinForms or Windows APIs.
As I've mentioned, .Net 5 is the first release in the .Net Unification, with .Net 6 and Maui basically everything that is not OS specific (again, if your project uses OS APIs that is of course something that is limiting) will be multiplatform.
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IIRC there is very little that is Windows-only. .Net Core was much more Windows-oriented. The things that are Windows-only are like that because they are not available in other platforms, like for example WinForms or Windows APIs.
As I've mentioned, .Net 5 is the first release in the .Net Unification, with .Net 6 and Maui basically everything that is not OS specific (again, if your project uses OS APIs that is of course something that is limiting) will be multiplatform.