I found out how to get high resolution widescreen:

For resolutions above 1280x720, go to your "my documents" folder in the rogue trooper folder.

save0.rtp file

Ex. 1680X1050

Go to offset 17C and put in your 1680 resolution in hex with the bits flipped.

so you would put 9006 (which is 1680) then in offset 180 you'd put 1A04 (1050).

Good old http://pcgamingwiki.com, but I know bugger all about hex coding so does anyone know what the code for 1920x1080 would be?

Accessories - Calculator - Programmer's mode (IIRC).
Enter 1680 - switch to hexadecimal - turns into 06 90.
Clear - switch to decimal - enter 1050 - switch to hexadecimal - turns into 04 1A.
Now you just need to flip the bits, in pairs: 90 06 x 1A 04.

1920 x 1080 in hex is 0x0780 x 0x0438. Flipped: 80 07 x 38 04.

Thanks, I just copied what is above from the web page, there was no explanation as to how hexadecimal works or list of any other codes.