Nebie Q, backing up Half Life...

[javv5]

Right, I'm completely new to this. I want to back up my copies of Half Life and Oposing Force but they keep on looking like they are being backed up as music files...
I'm using a Plexwriter 24/10/40A and Nero Burning 5.
I've also tried Clone CD and it has the same results.

So, what am I doing wrong? Is there something I should be aware of or another tool that might help?

Thanks.