I tried opening an RPT file in Notepad, and it looked like this:
I then tried opening it in Notepad++, after discovering that it would be more suitable, only to be faced by this:
Can someone please explain to me what needs to be done to read this file properly?
I'm guessing this is a Crystal Reports RPT file. You might try opening it in Visual Studio to see if it will render anything useful. In theory, VS might understand the binary file information, break it down into some sort of object representation and then display for you those objects.
Otherwise, the Crystal Reports software could do the same.