Ok, 2 points there:
1) Since when are hackers the only ones with illegitimate copies of Windows?
2) Will *never* happen? Really? Big claim, no evidence.
The really frustrating thing however is that Windows simply refuses to let you discover what that file extension is without making you go through the tedious task of turning them all on. How hard could it be to list it in the properties window for that file? Or perhaps be wildly radical and actually even let you change the file extension there! In fact, if it unequivocally told the average user what the real file extension on a maliciously named
"She'll go 300 hectares on a single tank of kerosene."