It's so stupid that it can't bring open an UAC prompt instead. Come on Windows you have a standardized way to elevate! Why don't you use it?

Kudos for being willing to try it and see!

One very minor detail to note, in your test you weren't actually overwriting the original file that you opened, but instead Notepad appended a .txt to the filename, which is its default behavior, but you still got the same type or error because you didn't have write permission for any file in that directory.