Figuring out how other people's code works is a pain. Studying your own code that is several years old is essentially the same thing. So even if they had all the sources it still would have taken considerable effort to build an operational version let alone to modify something significant. Even building it on the very same software they used back then does not guarantee that it works right away. I doubt that someone other than some enthusiast is going to waste time to 'revive' those sources.
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