Do any of you know who the author of this file is?
I have several such files, but all of them simply have an icon with the inscription JJ. I don't know what these files contain (most likely lipstick). I'm just going through CC content assemblies downloaded from torrents. Here is the icon of one of the available files:

That one is a default replacement lipstick, and there's no other info than the swatch picture + the lip texture in the file.

This creator looks like they're using "JJ". Not sure if this is the correct download (there is an "Umber.package" there), but you can look through their items if it's not the same:
https://modthesims.info/d/317631/li...s-defaults.html

(I did a search for "Sims 2 default lipstick jj" on google, and that MTS page came up as one of the first 8 picture searches. Wasn't much to go on, but sometimes a little bit is all that's needed).

I'm guess it stands for the creator name. Off the top of my head, the only JJ I can think of is Julie J, but it could be anything. Is there no other name or identifier in the file? (I'm on my phone so I can't look right now.)

Not mine unfortunately but a nice lipstick nevertheless