Can the serial key of a retail version be checked by Run/regedit on Windows ?

[Petike]

I can only ever find the key and setting configs, individual save files and text files relating to the HPL engine. Plus, the folders for my in-game accounts - the main one and the CS developer one. That's sadly it. As hard as I try, there just doesn't seem to be an hard drive copy of my serial key file.

I'll be waiting for a reply from the retailer. Hopefully something will pop up in the coming days. If not, I'll try to make the best of it, or try the aforementioned 1.3 trick or just eventually rebuy the whole thing.