Introduction : I was surfing the net when I found by chance a blog post about a bug found in calc.exe under Win7 64bit. http://marcoramilli.blogspot.com/2013/08/bug-in-wincalcexe.html I've tried to reproduce right away in the same environment and then calc.exe crashed. I hadn't any stuff going on so I said to myself why not do a root cause analysis of the bug ? and as I started taking notes it tur