Thanks for the very helpful info, Those files don't seem to be there. I extracted the main game again into a new folder and I still can't seem to find them.
I'm wondering if I should try installing the disks with wine again instead. I have a feeling I will be able to point Openrct2 at the wine folder now I don't have the broken version of Openrct2.
What do you recommend?
EDIT: I installed the base game via wine and found a heap of audio files, more than listed above. I copied them all over and it seems to have fixed it. I have no idea why unshield didn't extract them. The only audio file unshield extracted was CSS2.DAT.
Anyway it seems to be good now, though I haven't fully tested everything, but the dodgems has its iconic beats now at least.
Thanks once again!