NUL is not a printable character anyway. In binary file viewers (and editors) it is customary to replace all non-printable characters (ie 0x00 to 0x1f and 0x7f to 0xff) with a dot in the character display.

In reply to Re: Displaying NUL in a TK::Text widget by DrHyde
in thread Displaying NUL in a TK::Text widget by thor

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