Hi Max.
The stock game files are encrypted if you purchase the game through the Windows Store. I am not fully familiar with the technical reasoning, but I believe it has something to do with the type of applications the store installs. Premium add-on content is also encrypted to help prevent piracy. However, your community folder shouldn’t be encrypted as this is where you can manually install addons/mods.
You can set the path of your community folder during the first launch. If you left it as default you will have to follow these steps to move it.