For those of you looking to begin fiddling in The Sims 4 package files, know that The Sims 4 Package Editor is already in the works. Currently, version s4pe v0.1a is available to download.
❗ Please note that altering files in your game can cause the game to malfunction. Unless you know what you’re doing, do not attempt to edit game files.
❗ Please direct all comments and concerns to the creator of this mod
❗ The Sims Wiki has a great list of Packed File Types