This is caused by incorrect MIME handling by Windows when 'DBF Viewer 2000' is installed. The 'DBF Viewer 2000' program associates the .DBF file extension with 'application/DBF Viewer 2000' instead of 'application/octet-stream'. Remove 'DBF Viewer 2000' from the affected system. If you are still experiencing the issue I can suggest this program DBF Repair Toolbox https://www.repairtoolbox.com/dbfrepair.html
Cannot upload DBF files to JIRA on Windows
in Database Support
Posted
This is caused by incorrect MIME handling by
Windows when 'DBF Viewer 2000' is installed. The 'DBF Viewer 2000'
program associates the .DBF file extension with 'application/DBF Viewer 2000'
instead of 'application/octet-stream'. Remove 'DBF Viewer 2000' from the
affected system. If you are still experiencing the issue I can suggest this
program DBF Repair Toolbox https://www.repairtoolbox.com/dbfrepair.html