https://bugs.winehq.org/show_bug.cgi?id=46161
--- Comment #13 from Jacek Caban jacek@codeweavers.com --- Not really, note that as long as the code in schannel.c is not aware of TLS1.3 (and I tested that although TLS1.3 is defined in headers, Windows doesn't support it so I'm not sure we want to), it will never be actually enabled. My patch made only gnutls backend aware of TLS1.3, which meant in practice that it would be always disabled, so we'd always append -VERS-TLS1.3 to the priority string.
Headers are already in Git: https://source.winehq.org/git/wine.git/commitdiff/40c847d8074770681d1c6434fd...
I took another look at this and sent a simpler patch: https://source.winehq.org/patches/data/155698