INT 21 O - DR DOS 6.0 - SET FILE OWNER                                          
	AX = 4307h
	CX = ??? (owner identification number?)
	DS:DX -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. filename
Return: CF clear if successful
	CF set on error
	    AX = error code (see #01680 at AH=59h/BX=0000h)
Note:	no longer supported by Novell DOS 7 / OpenDOS
SeeAlso: AX=4306h