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  Function 3AH (decimal 58) removes (deletes) a subdirectory exactly as the
  DOS command RMDIR does. To invoke this function, create an ASCIIZ string
  containing the pathname of the directory you want to remove. The register
  pair DS:DX points to the ASCIIZ string. If an error occurs, function 3AH
  sets the carry flag and returns an error code in AX. The possible error
  codes are 03H (path not found), 05H (access denied), and 10H (attempt to
  remove current directory).