When users try to restore XP .bkf file in Windows 7 through NTBackup Restore Utility for Windows 7 but get an error message stating the backup file contains unrecognized data and cannot be used while restoring BKF file because this BKF file got corrupted in Windows 7. In this situattion user should try BKF repair tool which is a perfect solution to fix the BKF error issues on the system. Handling the interface is other difficulty that is faced by computer users trying to extract or restore Windows XP backup files in Windows 1087 Operating System. So if user need to restore XP files using NTBackup utility but is unable to do so owing to mis-functioning then BKF Repair Tool can be used. Backup file contains unrecognized data - this message can occur due to many reasons like: CRC errors Virus attack and so on but you can resolve it by one solution and that is BKF Repair tool. So use it to repair corrupted Windows NTBackup files. If you want to verify this software before investing in the full version then download the free demo version and assess it and view the full corrupted database which is there inside .bkf files. For full recovery process purchase the licensed version at just $89.