in reply to 32bit DBM files and a 64 bit perl.

In general, you cannot call 32-bit code from 64-bit executables.

You'll almost certainly need to (at least temporarily) install a 32-bit version of Perl (or perhaps a 32-bit compiled utility gdbmexport) so that you can export the db into its portable flat file format and then import it into a 64-bit compatible GDBM file.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In Section Seekers of Perl Wisdom