What is your Translating between Different Versions of PowerPoint issue?
Responses:
Builds do not work when running 7.0 presentation in 4.0
Custom properties are gone when looking at 7.0 presentation in 4.0
Interactive buttons do not work when running 7.0 presentation in 4.0
Presentation translator does not appear in the list of file types
Some document properties are gone when looking at 7.0 presentation in 4.0
How to: Convert older PowerPoint file to PowerPoint 7.0 format
How to: Read PowerPoint 7.0 file in PowerPoint 4.0