How can I find SilverKeeper backup files on an external HD?

My mum’s iMac G4 got fried by a power surge this morning, and she has been backing her computer up to a Lacie External HD using their software called SilverKeeper. When I went to retrieve the files, I can find the backup file as a disc-image and load a disc image of my mum’s home folder from the HD, but while all the folders and their sub-folders appear, there are no actual files in any folders. How can I retrieve the files, because we only have computers running 10.5 and SilverKeeper isn’t compatible with anything above 10.4?