https://bugs.winehq.org/show_bug.cgi?id=35651
--- Comment #17 from tokktokk fdsfgs@krutt.org ---
tokktokk you don't need to install codecs to see the videos on Wine.
Without codecs it's just not skippable black screen.
Could you reinstall the game on a new wineprefix without install third software (no codec or other dll)
I tried, 2.21 staging, but not with battle.net version.
What Warcraft III version are you using?
1.28.5.7680