Ask him to push printscreen button and make him the 20 lines Clearwin+ program to save this clipboard information to graphics PNG file. So one push and one click (or another keyboard combination) and you are done. You can add mouse ribbon bands to select part of graphics screen before saving but this is a bonus.
But as I remember crash report window has an option to save, no?
As to your way of finding errors: would appreciate if you post an example of such window, better on Postimage and explain exactly step by step how do you use this binary information from it to find and fix the error
The only way I can find any errors in large codes is by running the code via debugger.