INT D4 - PC-MOS/386 v5.01 - GET/SET EXTENDED DIRECTORY INFORMATION              
	AH = 03h
	AL = subfunction (00h get, 01h set)
	DS:(E)DX -> pathname
	ES:(E)BX -> 10-byte buffer for directory information (see #04005)
Return: CF clear if successful
	    AL = permitted access level for file (00h-03h)
	    ES:(E)BX -> modified buffer (AL=01h on entry)
	CF set on error
	    AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
Notes:	BX/DX are used in V86see Virtual-86 Mode mode, EBX/EDX in native mode
	the file class cannot be changed for files because it affects the
	  encryption method, but directories can have their classes changed


Format of PC-MOS/386 directory information:
Offset	Size	Description	(Table 04005)
 00h	BYTE	reserved (0)
 01h	BYTE	file class ('A'-'Z' or 00h)
 02h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	user ID of file creator
 06h	WORD	file creation time (see #01665 at INT 21/AX=5700h)
 08h	WORD	file creation date (see #01666 at INT 21/AX=5700h)