https://bugs.winehq.org/show_bug.cgi?id=23863
--- Comment #32 from Paul Gofman gofmanp@gmail.com --- I additionally googled for some values people have seen for MaxVertexW, and saw some device caps dumps with this value of 0. I checked that The Bard's Tale is happy with 0 either. In this case it sets a constant of 1.84467e19 for shader instead.