You'll need an unzipping program such as Winrar or 7zip to unzip the .rar file.
Viewing post in 3:00 AM at The Krusty Krab comments
That is very odd. After downloading the game and only unzipping the .rar (no need to compress it to a zip), it should just be a simple folder with the application and everything inside. Something on your PC must be reading it as a Microsoft Edge File for it to be doing that. Not sure what the cause could be. Sorry!