download an mp3 album that unzips automatically?

Hi, I would like to know whether there's a way to have mp3 and pdf files unzip automatically, rather than the customer having to unzip it their self.

I know one may say that it is not a big difference for the customer to unzip vs an automatic unzip. But i think this little difference adds to the quality of service to the customer.

I just wanted to see how Amazon does it, so i've just bought an album from there, and what they do is have a software which downloads the album directly into itunes, windows media player or whatever is your default player.