How to check if a binary is 32 or 64 bit on Windows?

After examining header values from Richard's answer, I came up with a solution which is fast, easy, and only requires a text editor. Even Windows' default notepad.exe would work. Open the executable in a text editor. You might have to drag-and-drop or use the editor's dialog, because Windows doesn't show option in the context menu for executables. Check the first printable characters after the first occurrence of . This part is most likely to be surrounded by at least some whitespace (could be …