[CODING] Help for some code (Steam Portable)

Hi there !
I'm currently looking to improve my Steam Portable launcher, but some dependencies are making me crazy. And that's why I'm posting here, I need some little help :
With my launcher, I'd like to put some multiple regkey handling, that is to say that the user will only put in a .ini file all the registry keys he wants to backup (these keys separated to each other by ||, like in the PortableApplicationTemplate famous on Internet). But what sort of code should I use in order to make my launcher able to manipulate all these keys without any problem, and with one single piece of code ?

If someone would help me, it would be very appreciated.