https://bugs.winehq.org/show_bug.cgi?id=47893
--- Comment #6 from Nguyễn Chính Hữu huupoke12@gmail.com --- Yes, like what I have said, it only show properly the Basic Latin block (https://en.wikipedia.org/wiki/Basic_Latin_(Unicode_block)) and Latin-1 Supplement block (https://en.wikipedia.org/wiki/Latin-1_Supplement_%28Unicode_block%29). It seems to be the behavior of ISO/IEC 8859-1 (https://en.wikipedia.org/wiki/ISO_8859-1).
If the character is outside of those blocks, it can't be shown and only be presented with a "?". You can try changing the "Real Name" in your preferences to see it.