Hello, and thanks for checking out our game! :)
.rar files work exactly like .zip files if you have used them in the past!
You simply need a program like winrar (https://www.win-rar.com), but of course any other compression program you want to use is fine!
You just need to extract them where you like and the game will be ready to play :)
Apparently there's an online extract as well, we just found out:
https://extract.me
Let us know if we can do something more or if something is unclear! :D