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.
      MMIO_CF_FAILURE
        The function failed. A call to mmioGetLastError might return one of the following errors:

        MMIOERR_CF_NON_BND_FILE

          Tried to close a non RIFF compound file.
        MMIOERR_CF_ELEMENTS_OPEN
          Compound-file elements are open.
        MMIOERR_INTERNAL_SYSTEM
          The operation failed due to an internal system error.

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