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Windows 2000, NT, XPBy User:
mrpijeyUpdate: We've still only got a very small partial of the file, and the OP doesn't seem to bother reading his PMs, but from the file header it seems to be just a custom ISO made with IMGBurn in 2016, and size seems to match the original (broken) leak. There are no original MS headers left in the image whatsoever so this is by no means an original Microsoft disc and most likely just a reburn with a custom disc artwork.
File dates within vary between 1999-09-09 and 1999-12-10 with different timestamps, also uncommon for an original Microsoft disc. I386 folder is identical except for a single file, the OP's release has one additional file called SSFLYWIN.SC_ which is a screensaver file. Apart from that both releases seem identical, except for the timedate stamps and volume header.
Since it's partial we can't really check individual files and we're still waiting for a completed upload. But from what I can deduct it's highly unlikely this is in any way closer to the original Microsoft release than any of the various modded ones that has circulated around the net.
Please complete the upload, but from what we can see it seems you've been duped into believing this is the very original Microsoft leak, if that's the case.