https://bugs.winehq.org/show_bug.cgi?id=52627
--- Comment #5 from Carlo Bramini carlo.bramix@libero.it --- Probably, LTSpice is using U+03A9 "GREEK CAPITAL LETTER OMEGA" instead of U+2126 "OHM SIGN". They are identical, but in current WineTahoma fonts, U+03A9 is missing. Fixing should be easy, with FontForge it is just needed to copy U+2126 and paste it to U+03A9.