Package files for the Sims 4 are showing up as sims3.package files?

I am having the same exact problem. I went to the link that rosemow provided and followed the instructions. The problem is that there is no option for any Sims related files. I installed s3pe a few months ago when I went back to playing Sims 3. Once I uninstalled Sims 3 again I also went to uninstall s3pe. Well, even though I removed it, my Sims 4 CC all says "Sims3 package". I have scoured the internet and have yet to find a resolution. It's really irritating.