The data set on device '%ls' is not a SQL Server backup set.
The backup being restored conforms to the Microsoft Tape Format, but is not a Microsoft® SQL Server™ backup. The backup may have been written by another software product.
To determine the contents of the backup, consider using RESTORE HEADERONLY.
BACKUP | RESTORE |
Backing Up and Restoring Databases | RESTORE HEADERONLY |
Errors 3000-3999 | Troubleshooting Backing Up and Restoring |