https://bugs.winehq.org/show_bug.cgi?id=32083
--- Comment #19 from super_man@post.com --- (In reply to Zeke Sonxx from comment #18)
I can confirm that the issue still exists on Wine 1.9.4. The splash screen does, however, show up when I launch the game in my Windows 7 VM.
Some poking around the executable has revealed that the launcher image is a bitmap (.bmp) image. (Diablo III.exe/.rsrc/1033/BITMAP/10033.bmp).
Could you open that file with some file editor that exposes the file details?