what is your current resolution? you can type xrandr to find out
EDIT: nevermind, i didn't understand your post fully; the short answer is you can't, a program can only have as high resolution as your workspace currently has, if your workspace is in 1024x768 and you select 1280 for regnum, you will get a 'virtual' workspace where you have to drag the mouse around to see the entire workspace
you must run the workspace in 1280 in order to be able to run regnum in 1280; however, assuming you start X in 1280, you can then use xrandr to set your resolution to 1024, thus giving you your regular 1024 resolution for every day work, and then you can switch to 1280 when you want to play regnum
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