let me try to squash this one and make my first post
Naturally if it was a "printer usb cable" (a-b) *DRIVERS* would be VERY necessary to be able to access a printer, unless it was specifically a printer that nintendo themselves have put out with some kind of drivers built into it, or a disc would come with it containing some kind of drivers.
I bought my wii 3 weeks ago, I have nothing similair to this that came in my packaging.
I think your girlfriends brother or whoever it was is pulling your leg, or perhaps set his box on the USB cable before he started opening the box perhaps?
None the less, its just a USB cable! :-D A cool colored one at that! hoorah!