There are more than one reasons for the occurrence of such error messages. Here they are:
- Excel file is located on a server that is currently unavailable.
- When you try to open a damaged or corrupted Excel file.
- You don’t have sufficient permission to access the file.
For better suggestion on issues related with Microsoft Excel recovery have a look to this thread: https://www.repairtoolbox.com/excelrepair.html

Try open it here: https://www.openfiletool.com/dbfopen.html