Which operating system are you using? Many of those DVD's use Flash to run their files. Unfortunately, Flash is no longer being supported by Microsoft.

Usually the individual files are in a PDF format. If so, then you can open them individually. You will need to make an index for the files. That is what I had to do when I installed Windows 10.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now