Format of VINES Function 0004h/Subfunction 0002h request block:
Offset	Size	Description	)
 00h	WORD	0002h
 02h	BYTE	drive number (0=default, 1=A, ...)
 03h 16	BYTEs	reserved
 13h 64	BYTEs	buffer for null-terminated file service name
 53h  5	BYTEs	reserved