http://support.microsoft.com/default.aspx?scid=kb;EN-US;278973
NOTE: Use the Excel 5.0 source database type for Microsoft Excel 5.0 and 7.0 (95) workbooks and use the Excel 8.0 source database type for Microsoft Excel 8.0 (97) and 9.0 (2000) workbooks. The ExcelADO.exe sample uses Excel workbooks in the Excel 97 and Excel 2000 format.