I have the files but I haven't uploaded them as they are very big. I imagined one of the other programs would create the files, but I've yet to discover it. I believe these files are precomputations that are meant to speed up the algorithm.
I can't think what else would be in the file. I would have guessed the file was generated by the program and would contain relations from a sieving run for the last large factorisation your uncle did. But I also don't see how these files get generated by the code.