My job is so secret, even I don't know what I am doing.

I'm with you. We have to ship software updates around to all our customers and use the buit-in ZIP support in XP and 2003 Server. It mightn't be the best but the last thing we want is to have to install and support another piece of software and much less, pay for one, at every site. We're talkin' users here, not geeks.