https://bugs.winehq.org/show_bug.cgi?id=55132
--- Comment #6 from pernegger@gmail.com --- Would you mind sharing your relevant font replacements? Maybe the HOWTO you used, if any? I've never needed any before, and I'm not getting anywhere just using Google, I'm afraid.
FWIW, WINE regedit also shows weird behaviour. Japanese text shows up fine--except while editing Japanese names/data, i.e. when the text changes into a textbox in place, then Japanese characters show up as boxes. Confirm the edit, and all is fine again.