Try renaming the file with the correct extension (e.g., .xlsx for Excel workbooks). If needed, open the file in Excel, save it as the correct format, and close it to apply changes.

Select Properties from the context menu. Properties of Excel File In the Properties menu, select the General tab at the top. Scroll down to the Security section and click the Unblock button.

First try to rename file. Go to tools, folder options, file types and check have you .xlsx extension. If not then rename the file .xlsx to .xls Second try to use excel command in file menu – Open and ...