MZ isn't a magic number, it's a tribute to Mark Zbikowski, who was one of the lead developers of MS-DOS @Microsoft. The MZ header marks the beginning of DOS executables & later became part of the PE (Portable Executable) format used by Windows. I played with MZ by Norton, guess!

hah, i didn't know the thing about Mark Zbikowski. cool

I am still a noob at this. I can learn by watching and doing. Can you lead me to more of videos on windows apps structure and app security

Of course, Umer. I'll make a good post.