rc (ULONG)

      Return codes indicating success or type of failure:

      MCIERR_SUCCESS

        If the function succeeds, 0 is returned.
      MCIERR_MISSING_FLAG
        A required flag is missing.
      MCIERR_INVALID_FLAG
        Flag (ulParam1) is invalid.
      MCIERR_FLAGS_NOT_COMPATIBLE
        Flags cannot be used together.
      MCIERR_MISSING_PARAMETER
        Required parameter is missing.

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