Sorry, the extraction works fine. It's the extracted file that the computer can't read. It's a .package file?
Oh, that's a different issue then. Your computer does not need to read a .package file, it doesn't matter what it thinks of them, and they do not need to be double-clicked upon. The game reads them when they are placed into the Mods\Packages sub-folder. But in TS3 the Mods Framework needs to be set up so that the game can read them. All mods are .package files, custom content can be either .package as well or .sims3packs that are read and installed by the Launcher. Package files don't require a new program, it's really three nested folders and the required Resource.cfg file in the correct place.
Comments
https://modthesims.info/wiki.php?title=Game_Help:Installing_Sims_3_Package_Files/Setup_and_Files
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