how does windows wchar_t handle unicode characters outside the basic multilingual plane?

I've looked at a number of other posts here and elsewhere (see below), but I still don't have a clear answer to this question: How does windows wchar_t handle unicode characters outside the basic multilingual plane?

That is:

• many programmers seem to feel that UTF-16 is harmful because it is a variable-length code.
• wchar_t is 16-bits wide on windows, but 32-bits wide on Unix/MacOS
• The Windows APIs use wide-characters, not Unicode.

So what does Windows do when you want to code something like (U+2008A) Han Character on Windows?