Dave is playing on a Mac.
You learn UnrealScript mainly by reading other people's code. Removing code without an important reason (download size reduction and lack of helpfulness are not important in that sense) is extremely antisocial IMHO.
I'm pretty sure I have the original discs for the Mac UT 2004. DM me if you're still looking.
If that's not helping, I think "Enyo" was also playing on MAC. You can find him there: https://www.omnipotents.com/forums/
Igen, ez PC verzió én jobban szeretem a játék dobozos példányát/ változatát. csak gondoltam megmutatom, hogy ikertestvérem és én ezt használjuk