http://bugs.winehq.org/show_bug.cgi?id=16328
--- Comment #22 from Milan Troller gad.pade.r@seznam.cz 2009-01-05 14:34:21 --- On some forums I watch, somebody had problems with service pack detection on native windows in GTAIV, and somebody mentioned string CSDVersion in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows\CSDVersion where is the service pack version. Each hundred (i.e: 100 = SP1, 200 = SP2) represents a service pack. So you can fake one.
I don't know if this could help, but I just noticed it, so I post it.