I got this warning message from Microsoft Excel when I try to download a chart from my DCA analysis to Excel. It states that the file format and extension does not match, what does this mean?

This warning is a known issue related to the functionality of Highcharts, the component we use to manage input and output objects in the dashboard. Despite the message from Microsoft Excel stating that the file format and extension do not match, the downloaded file is fully functional and safe to open. It will contain the data from your DCA analysis chart as expected. We apologize for any inconvenience caused by this warning message.