Originally Posted by hardrock_121
do they have to be .cd1 and cd2 exactly??? 1of2 or 1/2 dont work?
No, XBMC uses standard naming conventions to avoid confusion which might occur when multi-part movies aren't split into individual folders.
You can use .cd1 or -cd1 perfectly fine - maybe you can run a find & replace on your filenames to swap "1of2" to ".cd1" etc?
Otherwise, I believe XBMC offers a way to add to the standard set of stacking rules with the advancedsettings file - have a look here
. It's not the easiest, though - and you might also need to take a look at this