bsddb

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    Marc> "DB_VERSION_MISMATCH: Database environment version mismatch --
    Marc> Program version 4.4 doesn't match environment version 186187776.0"
    Marc> DBError: -30971

I haven't used bsddb much recently, but in the past I think this usually
meant that the Sleepycat folks released a new version of their package with
a new file format.  You're probably trying to read an old format file with a
newer version of their package.  There is a db_update command that's part of
Berkeley DB itself (not sure if the Windows installer for Python ships with
it) which should be able to read your old file and dump you a new one.

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