No to je celkem jasne, protoze nazev AUX je pod DOS i WIN rezervovany pro system a NESMI se pozivat jako nazev souboru. A jsme doma.

In addition, in Windows and DOS, some words might also be reserved and can not be used as filenames.
For example, DOS Device file:
CON, PRN, AUX, CLOCK$, NUL
COM0, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9
LPT0, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9.