[Carts]

you need to go into your confi file and edit it manually,after you have done it,do not change anything in set up or it will revert to a lower resolution and 16 bit.
Heres how i have mine


[window]
width=1680
height=1050
ColourBits=32
DepthBits=24
StencilBits=8
ChangeScreenRes=1
FullScreen=1
DrawIfNotFocused=0
EnableResize=0
EnableClose=1
SaveAspect=0
Use3Renders=0