Why do I get warning message while exporting KPI to Excel 2007?

Why do I get warning message while exporting KPI to Excel 2007?

It is an MS Office compatibility Issue. ARC has been certified on MS Office 2007 and above from 6.2 version. Possible workaround: a) Save the Excel file first and then try to open it b) Other option is to click on 'yes' when it prompts to open the excel file It is just a compatibility message.