https://bugs.winehq.org/show_bug.cgi?id=41930
--- Comment #42 from Bryan Varner bryan@varnernet.com --- Patches from Comment 25 and Comment 28 makes the game playable but _do_not_ fix the underlying issue.
The patches effectively fail to allocate a pbuffer context, which the game authors were intelligent enough to code around and degrade graphics overlays accordingly.
The underlying issue is an offscreen WGL pbuffer being drawn opaque (copy over destination), instead of doing an precomputed alpha merge into the destination from the pbuffer source.