Int 21 Fn 713B  - Windows95 - Long Filename - Change Directory             [D]

   AX = 713Bh
   DS:DX -> ASCIZ long name of directory to make current

Return: CF clear if successful
   CF set on error
       AX = error code (see #1366)
       7100h if function not supported

Note:  for compatibility with DOS versions prior to v7.00, the carry flag
     should be set on call to ensure that it is set on exit

See Also: AH=0Eh,AH=3Bh,AX=7139h