Troubleshooting: Exporting to Excel
You can export data to an Excel spreadsheet by selecting the Export to Excel item in the right pane's toolbar. When you do this, the data is written in HTML/CSS format and saved with a .XLS extension. Excel 2007 (and above) expects the data in a .XLS file to be in Excel binary format and will display a warning when you attempt to open the file. You can safely answer "Yes" to the warning dialog box to open the file.