This is too easy. From what I have found, this works on EVERY audi from 2001 up (maybe earlier, but I don't know for a fact). Even if the vag-com doesn't bring up the bubble for the adaption to the code, all you have to do is add "64" to the number already there. (note: always write your original number down before changing anything)
I did this on Claudia's "01 A6 and on my "06 A4.