INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - EXTENDED ATTRIBUTES
	AX = 112Dh
	BL = subfunction (value of AL on INT 21)
	    02h get extended attributes
	    03h get extended attribute properties
	    04h set extended attributes
		Return: CF clear
	    else ???
		Return: CX = ??? (00h or 02h for DOS 4.01)
	ES:DI -> SFTsee System File Table for file
	SS = DOS DS
Return: DS = DOS DS
Note:	this function is called by the DOS 4.0 kernel on INT 21/AX=5702h,
	  INT 21/AX=5703h, and INT 21/AX=5704h
SeeAlso: INT 21/AX=5702h,INT 21/AX=5703h,INT 21/AX=5704h,INT 21/AH=6Eh