mbx repair

I received the following suggestion:

1.  Find or create another mbx file "spud".
2.  Copy header:    $ dd if=spud count=4 > newbx
3.  Copy old file:  $ dd if=oldbx skip=4 >> newbx
4.  change ownership and permission to match oldbx.

This did not work for me.
Should it?
I thought the header contained information tightly tied
to the rest of the content (to speed search etc) so that
e.g., byte counts could matter.

The suggestion above came with a claim that the header
for any valid mbx file would be a valid header for any
other mbx file.

Can you point me to documentation of the mbx format?

Thank you,
Alan Isaac






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