Either this DVD is based on an earlier beta, or a normal knoppix and just remastered to be really huge.

The error with the DVD files, was due to the cloop not working above 4gb ( 32bits ). This was fixed in version 1.0 of cloop, and in Knoppix version 2003-07-24 : http://www.knoppix.net/forum/viewtopic.php?t=3797

If this remaster is based on the DVD beta, then the cloop modules and tools will need to be replaced.