Hello, I just downloaded FireFox 8 because I've had enough of IE. Now, when I click on an Excel file in Sharepoint 2010 it opens it directly in Firefox, without the option of download/save. I need to open these files in Excel so I have the analysis and editing of Excel. How do I bring this option back so that it doesn't directly open in Firefox? When I click the Open in Excel button, I get an error '''''''To open this workbook, your computer must have a version of Microsoft Excel installed and your Web browser must support opening files directly from Excel in the browser.'''''''