This is because your Windows 10 notepad is not the same as the format of the author's in garbled code.You just need to check online how to change the format of the notepad, so it won't be garbled.
This is the game's code file, it's "compiled" wich pratically means it's hidden, to change it or even understand it you need a decompiler and the knowledge of what code language the game (or atleast, the file) was written in.
