Extended file attributes (INT 21h, B6h - Novell Net SFT Level II)

        Entry:
          AH = B6h
          AL = Subfunction
                00h get extended file attributes
                01h set extended file attributes
          CL = attributes
                1xxx xxxx  Write audit (to be implemented)
                x1xx xxxx  Read audit (to be implemented)
                xx1x xxxx  Indexing file (to be implemented)
                xxx1 xxxx  Transaction tracking file
           DS:DX = Pointer to ASCIIZ pathname
         Return:
           CF set on error
               AL = error code
                  FFh file not found
                  8Ch caller lacks privileges
           CL = current extended file attributes