Function 3Ah (58)        Remove Directory (RMDIR)

    Remove the specified subdirectory.

       On entry:      AH         3Ah
                      DS:DX      Pointer to directory name to be removed
                                 (ASCIIZ string)

       Returns:       AX         Error code, if CF set

       Error Codes:   3          Path not found
                      5          Access denied (directory not empty)
                      16         Cannot delete current directory

                      Call Function 59h for extended error code information
                      (DOS 3.0 and above).

       Network:       Requires Create access rights.

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    Function 3Ah (RMDIR) removes the subdirectory whose path is specified
    in the ASCIIZ string at address DS:DX; the string length is limited to
    64 characters. If the function is unable to delete the directory, it
    sets the Carry Flag and returns an error code in AX.