Don't panic, Ant, as I said in an e-mail. It appears that part of the archive was, mysteriously, passworded, and part not.
Jazhel, .7z, 7zip, was about two thirds of the size of a standard ZIP file, and that's a fairly big deal for Ant, as he's on 33k dial-up. ZIPs are relatively poor.
As for my part in this, what I did was unpack everything to the right directories for my own judging, then archived them retaining the neat structure, so Ant could just unzip everything straight to half-life and it'd all be in the right places for him. Every valid entry was send (the Source ones were not).
I hope that clears things up. We shall keep you all posted.