You can change your screen settings using the eaw.ini file.
I just made mine to the native resolution of my laptop:
[GRAPHICS]
Width=1280
Height=800
TestDrawPrimitive=1
DisplayDevice=0
Because the nVidia driver does not give horizon fog in d3d, I normally run in Glide mode and use the Glidewrapper.
Unfortunately this is old software which only allows 4:3 screens, and when I fly I get a Glide init error.
However, if I switch to d3d it works fine and runs the game at 1280x800.
Just edit your eaw.ini file to the screen width and height you need.
Jel