The file system is the same - Have you tried just opening them in 2000? You will only suffer if
you have used any features in the files that were not available in 2000, eg Coloured Tabs (Don't
laugh - I like em!!).
Other than that, there is no batch converter that I know of, but there is simply no better way
than trying.
The following link to a review by John Walkenbach, which will give you an overview of the
differences between 2000 and 2002 should give you an idea as to whether there is likely to be
anything in the files that may break. Personally I would expect 95% of those files minimum (even
without knowing what they are) to be no different whatsoever - even possibly 100%.
http://www.pcworld.com/reviews/article/0,aid,49607,00.asp
