Copy aa.cdx to aa1.cdx with windows explorer since cdx is not encrypted.A cdx can contain a *lot* of the content of indexed fields. It might pay to check out what the cdx looks like using modi file or similar. Anything interesting visible there? ;-)
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1