Therefore, you'll need a tool to extract these files.I recommend using Winrar (which, despite the name, can be used in both Windows and Mac) to extract your files. However, you can't just place a.rar or.zip file straight into your Sims 4 game. These files have been compressed by the custom content creator so you can download them and put them into your game. When you start downloading CC, you'll notice that many of the files end in names .7s, and so on.