The mso9.dll apparently is particularly prone to getting corrupted, and it usually causes troubles in PowerPoint, Word and Outlook rather than in Excel. There is a way to repair such corrupted files ...
If Excel keeps showing Want to save your changes message, uninstall Printer driver and change default printer to begin with. More suggestions here.
If you are experiencing the Download did not complete error message in Microsoft Excel, here are the troubleshooting methods to fix the error: Perform preliminary ...
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