INT 2F U - DOS 3.3+ internal - CLOSE FILE                                       
	AX = 1227h
	BX = file handle
	SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
	    AL = 06h invalid file handle
	CF clear if successful
Notes:	can only be called from within DOS
	equivalent to INT 21/AH=3Eh
	used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1106h,AX=1201h,AX=1226h,INT 21/AH=3Eh