INT 21 U - DR DOS 5.0-6.0 internal - GET ENCRYPTED PASSWORD                     
	AX = 4304h
	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
	    CX = AX = 0000h if no password assigned to file
	CF set on error
	    AX = error code (see #01680 at AH=59h/BX=0000h)
Note:	this function is only supported by DR DOS 5.0 and 6.0 and DRMDOS 5.1
SeeAlso: AX=4303h,AX=4305h