A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi Leonard,
A quick question before we proceed.
Is the issue specific to previous version of Excel file?
Let’s change the file association for Excel application and see how it works.
Try the steps below to change the file association and check.
- Right click on any of the Excel file which has problem.
- Select ‘Open With’ from the pop-up menu.
- Click Choose default Program.
- Select Microsoft Excel in the Programs box.
- Check ‘Always use the selected program to open this kind of file’.
6. Click ok and try to open the file.
If the issue still persist you may Repair Office 365 Installation and check if it helps.
You may refer to below link to Repair Office 365 installation.
http://office.microsoft.com/en-in/project-help/repair-or-remove-office-HA010357402.aspx
Hope it helps. Try the suggestions and let us know the result at your earliest convenience.
Thank you.