[agracier]

Eh i put in modsfolder ? but how can i set now to my 1680 x 1050 resolution??

Go to a file called 'conf.ini' - it is in the root of your game directory.
Open it with a text editor like notepad or such,

Then you need to change several lines to tell your game what your screen resolution is.

[window]
width=1680
height=1050
ColourBits=32
...
...
...
...
...
SaveAspect=0


This should work for you.
Don't forget that 'Saveaspect=0' also needs to be changed for the widescreen res to be reloaded each time.