http://bugs.winehq.org/show_bug.cgi?id=8848
--- Comment #19 from Luis Alvarado luisalvaradox@gmail.com 2013-03-08 14:50:35 CST --- I can confirm this is still present in Wine 1.5.25 in Ubuntu 13.04 64 bit. The solution is to disable Pixel Shader 2.0
Tested the game in multiplayer (Direct IP) and single player. The flashlight, model textures and shadows look all correct after disabling PS 2.0.