Please ensure the .xls file is not opened in other workbooks, add-ins, or apps. After coming to that conclusion, simply attempt to open the file again in Excel to see if the problem no longer exists.

Open Microsoft Excel. Go to “ File > Options > Trust Center.” Now, click on the Trust Center Settings button. Select Protected View from the left side. Uncheck all the options on the right ...

Since the introduction of Microsoft Office 2003 Service Pack 3, the software suite's applications have imposed more-stringent limitations on the kinds of files you can open and save. Implemented ...