Hello again
I haven't been here for a while, so I decided to check on the topic again. I downloaded the "XP Updates2.zip" file, and as with the first one, prepared the nifty program to have them covered by the Wayback Machine
And I'm proud to announce that almost all of those files have been saved!
(Where almost all of them, means the Windows Update and Microsoft ones.)
Besides, for the said checked links, I decided to see if there were duplicate links on both the first and the second version files, both themselves and together in a big text file. So there are, in total, and joining the first and second text files, 5650 links: 5648 that are finally done, and 2 with slight details:
One of them is AppLocale 1.0, which a Wayback Machine URL is in this topic, in previous pages. (I need to replace that link with the Wayback Machine one).
The other is for WMEncoder.exe, which another Wayback Machine URL is here (I need to add it up to the list, too).
I haven't been able to check the Wayback Machine URLs. I suppose they work (haven't had enough time to find out). And for the Mediafire links, I regret to say all of them are dead (BTW, I needed to thank publicly to the person who helped me check them: you rock! ). They were from an older version of the archiving website, and the conversion to get an equivalent link redirects to a page saying that each one of the intended files wasn't found.
Finally, for the sake of simplicity, I had to break the structure of both text files to come up with the unique URLs. I can upload that list here, but it's evident that the comments and grouping are necessary texts to know which files refer to which update. Haven't thought of a mechanism to relate those data. In the meantime, rest assured that those 5650 links are on the Wayback Machine as of now!
Thank you all for your cooperation and great help!