Why do people assume that because a file is old, it is no longer usable or supported? I have stuff going back 25-30 years that is still usable. The only trick to the matter is to make sure it still exists on media that is supported by the machine you're using. Plus, a large chunk of the files available then were in formats that were widely supported then and now. Plain text files are still usable, most images were bmp's, etc. The only things you had to worry about is proprietary file formats, which you have the same worry with files being created now.
That is why I strip the DRM from my ebooks. ePub is an open standard that has been supported in one form or another for a while (It is basically just some HTML stuffed into a zip archive, and is very similar to the predecessor OEBZip format).
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