Ok so I've been messing around with this for about an hour and I can't fathom out how to get it to work.
My logic tells me that back.bmp in "C:\Program Files\PokerStars\Gx\chips&deck\deck\simple" is what needs to be edited/overwritten (I'm using the simple theme) however when I load stars after this, no card backs show up at all and the card faces, which I never even touched, are all piling up on top of each other, essentially displaying incorrectly.

Anyone have any ideas or experience with this already?

Thanks :)