SOLVED: Google charts recognizes the "&" digit as parameters separator.
It's enough to change the "&" digit in the url into "%26"...
resulting code:
HTML Code:
<img src="http://chart.apis.google.com/chart?chs=150x150&cht=qr&chl=http://www.moddingstudio.com/downloads.php?do=file%26id={vb:raw file.id}&choe=UTF-8&chld=L|4">
It works very nice!
You can check out the final result clicking here:
http://www.moddingstudio.com/downloa...do=file&id=181