I have found a website that has successfully archived all of the Maxis released downloadable content for The Sims, along with relevant detailed notes on each object (including which expansion packs they were added to later on, and their original descriptions from the official Sims site, where they were released):

https://simarchive.wordpress.com/th...cial-downloads/

(The only thing missing are the preview images.)

A priceless resource that needs to be backed up, so that we don't ever lose it again.

I've archived/uploaded the whole content to SimFileShare:

http://www.simfileshare.net/download/4732288/

I plan to extract all the files from the installers and create a clean version of the whole package that I will upload to the Internet Archive. (If anyone beats me to it, I will have no problems with that -- go for it!)

Thank you for doing this!