rc (ULONG) - returns

      Return codes indicating success or type of failure:

      MMIO_CF_SUCCESS

        If the function succeeds, 0 is returned.
      MMIOERR_INVALID_HANDLE
        The handle passed was not valid.
      MMIOERR_INVALID_PARAMETER
        The parameter passed was not correct. For this function, a pmmctocentry NULL is invalid.
      MMIOERR_READ_ONLY_FILE
        The RIFF compound-file is opened as read-only.
      MMIO_CF_FAILURE
        The function failed. A call to mmioGetLastError might return one of the following errors:

        MMIOERR_CF_DUPLICATE_SEEN

          The requested entry already exists. This means that the element name is already defined in another CTOC entry.
        MMIOERR_NO_CORE
          Not enough memory is available.
        MMIOERR_INTERNAL_SYSTEM
          The operation failed due to an internal system error.

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