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I cannot delete a file called AUX.BAT or COM1!

A. A file of which the name (or a part of it) is equal to a DOS devices (NUL, COMx, AUX, LPTx, PRN...) cannot be deleted with Explorer or the usual DEL syntax. Use DEL \\.\drive:\path\AUX.BAT instead (replace drive and path with appropriate values). (The files may be the remains of a failed installation, you can create them e.g. with COPY some existing file \\.\drive:\path\COM1)

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