Planning to have something better, actually, when I get around to it. I want to make a .tre viewer/extractor that shows all file versions from pub 1-17, basically like as there was a .toc, but when you click on a while, you'd have the option to grab previous version of said file.
Sadly, after pub 17 they made split out .toc files (it was inside the .tre before), so I can't do something similar for everything after, unless someone provides me with more .toc files from after 17.