...
CDatabase xlsdb;
CString sDriver = "MICROSOFT EXCEL DRIVER (*.XLS)";
CString sExcelFile = "c:\\sale.xls";
CString sConStr;
...
sConStr.Format("DRIVER={%s};DSN='';READONLY=FALSE;DBQ=%s", sDriver, sExcelFile);
	TRY
	{
		xlsdb.OpenEx(sConStr,CDatabase::noOdbcDialog);
		if (!xlsdb.CanUpdate())
		{
//всегда 	попадаем сюда.
_tprintf(_T("Warning! Excel Data Source open in read-only mode!\n"));
		}
	}

	CATCH(CDBException, e)

	{
		_tprintf(_T("Error connected to Excel: %s\n"),e->m_strError);
		xlsdb.Close();
		return  1 ;
	}
	END_CATCH