http://bugs.winehq.org/show_bug.cgi?id=4529
------- Additional Comments From mike@codeweavers.com 2006-27-02 22:11 -------
GIF files displayed in the background of an element are displayed incorrectly, but those displayed in the foreground are fine. PNG files in either the foreground or background are fine.
Problem appears related to bitmap manipulation (either BitBlt, SetDIBitsToDevice or something along those lines).