My only other thought (on this issue!) is to ask the PP2000 user to install the Office compatibility pack and save the presentation in 2007 format.
After installing the Compatibility pack, there will be extra options for file types in the 'Save As' list - choose one with 2007 in it. They are at the bottom of the 'Save As' list (at least they are for earlier versions of Excel).
I have never tried this, so it is just a suggestion.
Look here for information on the compatibility pack - it states that it applies to Office 2000.