http://bugs.winehq.org/show_bug.cgi?id=17333
--- Comment #3 from Bryan Donlan bdonlan@gmail.com 2009-02-11 00:46:05 --- 0x89 0x50 are the first two bytes of the PNG magic - perhaps the game is attempting to load a PNG through some function which is only meant to load JPEGs?
Apparently windows allows this, whatever it is...