Hidden mp3's

a friend has supplied a DVD of tunes for me they are in folders on a Ritek dvd that he burned on his PC using an nec drive in windows XP.

I am reading them on my mac in osX with a pioneer dvr-104 superdrive.

I can see the disc and the folders however when i open the folders they are empty but the files are definitely there.

Is there a way to see the files?
:a

If they are hidden go to tools/folder options/view/scroll down and select show hidden files