r01, r02 etc are small bits of the one file, thats how winrar works, it separate a large files into smaller bits, and called them rar, r01, r02, etc..
I extracted one zip file and the nds file that came from it was called spf-mkde.nds (Mario Kart) Do I rename this or leave as is? Its a bit vague for a file title to know what exactly you have on your SD card
thanks for all your help... I've ordered http://www.dealextreme.com/details.dx/r.88888888~sku.10403 let you know how I get one....you've been a great help