Accessing file on a Knoppix Live CD without booting it

I have an old Knoppix CD V4.0.2 Kernel 2.6 dated 2005-09-23. It is too old to boot on any machine I have (I think because it does not have SATA support). It says Can't find knoppix filesystem, sorry. I would like to find a way to access the files in the CD without booting it. I assume this is some sort of mount of a file on the CD. I can access the files on the CD from linux (Ubuntu) with no problem. There is a large (600MB) file called KNOPPIX, and I have tried things like: mount -t auto -o loop KNOPPIX /media/tmp but it does not work. Is there a way to see the files that would be present on the filesystem after KNOPPIX boots and mounts its drives?