Easily resolves error message issue "the backup file contains unrecognized data and cannot be used" of BKF file then you will need to use MS backup repair - Windows software which assist you to repair all corrupted of BKF files and extract BKF files. We suggest you to try Windows backup file reader tool which has designed with latest algorithms - Quick Scan / Deep Scan / Range Based Scan features that can straightforwardly restore corrupt BKF files and able to solve all errors. MS backup repair - Windows tool supports Microsoft Windows XP / Vista / Win 7 / Win 8.1 and Win 10. Illustrating the features with trail version and examine how it is helpful for you at the time of backup corruption. With full commercial version you can repair corrupt ms backup database entirely at just $89 for Personal License only.