[Wine] x11settings

[Yeto]

Hi to everyone,

I use wine for a couple of years (since I changed to Linux  :D )

I got one game, that won't switch to fullscreenmode.
The following errormessage ist to be seen in terminal:
err:x11settings:X11DRV_ChangeDisplaySettingsEx No matching mode found 800x600x0 @0! (XRandR)

In windowmode the game works fine.
This game was written by a friend (so could it be, that there is some code, that wine don't understand?)   [Question] 

In hope of an answer

Yeto