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This is because CON is a MS-DOS device file. You cannot create a directory with this name for the same reason you cannot create a directory called COM1 or COM2 etc or LPT1. Because they are reserved for MS-DOS use.
Imagine trying to create a directory called "C:" and think of the ensuing problems from doing that. This is also why the character : is invalid for a directory/file name.
"Bush Hid The Facts"
Opening the file shows me the exact contents that I saved into it, no change.
I think it's because when you log on your machine cached credentials are checked first. If no cached credentials are found, then the normal conversation with SAM is taking place and it is more time taking.