As far as I'm concerned, the 3rd and 4th movies didn't happen. However, the T2 sequel books (written before T3 came out) written by S.M. Stirling may as well be canon. They are that good.
Equally likely is that a legitimate website has generated a backup file, log, report or whatnot and inadvertently put it in "in the clear" where it is indexed by Google OR rooted out by criminals familiar with software design flaws.
That was my problem with the entire book. It was not at all in the spirit of Indiana Jones stories and it really didn't fit his personality or style as established in the >half dozen books that came before it.