While we're at this topic, optimally I'd like a feature that lets me add Windows SP2 as a PreReq. But I don't want to bundle it with the installation, but only install it if it is available from the same location as the installation file. That way, we can still provide our software installer as a "light" download, but when we distribute it on CDs, we'd want to include the whole Windows SP2 upgrade along side with it.