Mystery files in Mods folder

Hey @kbexisfabulous I assume that you have previously installed The Sims 4 on the computer and had mods installed. These are the remnants of that. 

Darko

@kbexisfabulous  The files with a .blueprint, .bpi, or .trayitem file extension are Tray files: saved households or builds.  You'd want to put these in your Tray folder, that is if you downloaded anything you want to show up in the in-game library.

I can't see the file extension for the files labeled "Archive," but those are probably .zip or .rar files that Sims 4 won't read unless they're extracted.  You can right-click and Extract .zip files; .rar or .7z files need an outside tool like 7-Zip.

The only files that should be inside Mods are the ones that end in .package.

If you use OneDrive and have it linked to another account where you or someone else was playing Sims 4, that might explain the files' presence.  Otherwise, I'm not sure where they came from.

This is my first time ever installing The Sims 4. I believe I had The Sims 2 installed on this computer at one point.

@kbexisfabulous  Do you have OneDrive or another services that syncs files between computers or with a cloud storage provider?  Did you use CurseForge or another service to install mods and other Sims 4 user content?  If not, what did you initially download (just names, no links please), and what did you do, if anything, with the files after they downloaded?

The mods and Tray files in your screenshot are all quite old, so it's entirely possible that these were from a very old Sims 4 install, by you or someone else, and were added to this computer via OneDrive or a similar service.  It's also possible that you inadvertantly let the files be added to your Mods folder before you opened it manually, for example CurseForge deposits the mods in the correct location if you allow this.