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
        For this function a pszElementName, pchBuffer, or cchBytes NULL is invalid.
      MMIOERR_READ_ONLY_FILE
        The RIFF compound-file is opened as read-only.
      MMIOERR_CF_ENTRY_NOT_FOUND
        System failed to find CTOC entry.
      MMIO_CF_FAILURE
        The function failed. A call to mmioGetLastError might return one of the following errors:

        MMIOERR_WRITE_ONLY_FILE

          File not opened in read mode.
        MMIOERR_INTERNAL_SYSTEM
          The operation failed due to an internal system error.


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