You see, the problem is that whilst there are a couple of legitimate uses for SMC extractors, the vast majority of the illegal roms on the net atm are in SMC format. And everything else if you delete the original file, you can re-download.
Besides, even if you did extract all the files from an SMC, you wouldn't have any luck - since you can't decrypt them. Sorry to burst your bubble - if you had one.
If you didn't, please post your legitimate reason and we'll all try and help; but you won't be able to decrypt the stuff inside, just extract it (so if you *are* a pirate, we ain't going to help ya anyway, even if you do come up with a good excuse)