can't view DVD files, but it plays fine

I've got a burned DVD (burned with a standalone Sony DVDirect, if that
matters). It plays fine on my Mac, on a PC, and on a regular DVD
player. On the PC, I can view the original files in their folders
("Windows Explorer"), but on the Mac, the DVD shows "no files" when
viewed in Finder or from the Desktop. It seems like this is just a
"file attributes" issue, since the files are obviously there.

Any advice?

Thanks,

g.