This looks like an endianess mismatch; did you already mention on
what
architecture you are on?
MacPro, Leopard
Did you just move from a PPC-based Mac to an Intel-based one?
If so, you're out of luck --- you need to go back to the PPC
to make a dump of those files.
No, I just re-installed my Intel Mac. First I just upgraded from Tiger
to Leopard (without getting my database to run; but I didn't put much
effort into it); and then I completely erased the disk and installed
Leopard from scratch.
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TIP 5: don't forget to increase your free space map settings