New Post: Can XSSF open Excel 2003?

Hi All,

I can use NOPI.XSSF to read Excel 2007 files. And then I downgrade save the Excel 2007 version, and try to use NOPI.XSSF to read Excel 2003 file, but it fails.  Is it as designed? 

I want to open/write both Excel 2003 and Excel 2007 files, is it possible? 

Thanks

-Jerry