pc when i click it it make me choose how to open it in is it a add on to something?
Im not the guy that should be saying this but the guys that made this game seemed to have been hacked on twitter so...
you need to extract the archive with an app like WinRAR or 7-zip.
I assume you don't have either but you can download them on your browser both are free (well winrar isn't for companies but it won't matter to you) after installing one of the you have to right click the .rar archive and select extract here, it should extract the game files and you will end up with a folder that has all the game files like the one above you just run the .exe archive and that's it, hope i didn't make too many grammar mistakes, if you are still confused i would recommend to watch a youtube video explaining, they probably will explain it better.
hope this helps