Hi ,Mike_884
Welcome to Microsoft Community and thank you for sharing your concern with us today.
It may be recognized that this file is not closed due to interference in the Excel process.
You can try the following steps to see if it helps with this issue。
- Try to end the Excel process in the process manager, and then reopen it to try the effect.
Press Ctrl + Alt + Delete on the keyboard, and then select Task Manager. Find Excel, exit and restart.
- Cancel the add-on and eliminate plug-in interference.
Open the Excel program.
Click "File", open "Options", click "Add-ons", and click "Go" next to "COM Add-ons".
Uncheck all the add-ons in it and click "OK".
Reopen Excel to observe the problem.
- If the file is in a shared state and someone else is opening the file, it may not be able to be closed.
Hope this helps, and have a nice day.
Best Regards,
Hinata
Microsoft Community Support Specialist