Changing default resolution

[Althered]

Hi
I bought Battles in Normandy a few days ago and feel a little disappointed. Not with the game , but the resolution it runs in. My LCD monitor supports a minimum resolution of 800*600 but the program will only run in 2 higher resolutions by default. The units are much too small and text very hard to read and i would definately prefer 800*600.
Does anyone know how force the game to run in 800*600?
Any help much appreciated . Al .