Comment by rimliu

There are Windows technologies not available on OS X or Linux, is that Windows masterrace thing?

If there is no support for Windows it may indicate there was little demand for that. The biggest domain for Swift is still Apple OSes (macOS, iOS, iPadOS, watchOS, tvOS) and some attempts to use it on the server side. Swift is open source, if someone wants to make it happen on Windows, they are Welcome. I do not see the reason why anyone at Apple or anyone working on Linux would bother to do that.