Protect Workbook in 2003 changes to password to open in 2007
 

I created a workbook in Excel 2003 and protected the workbook with a
password. When the user saves the file as Excel 2007 I can no longer open
the file in Excel 2003 without entering the password. Is there a programming
difference between Excel 2003 and 2007 that I need to take into account to
stop this from happening?

Thanks