BKF Repair - Version 5.5 In case Windows BKF file got error message like “The Backup File Contains Unrecognized Data And Cannot be Used” then you should use to BKF Repair Tool is the latest technology for repair virus infected BKF file which is simple and fast recovery mechanism to recover BKF database after corruption in your system. Using this tool you will be easily get back all file formats like PowerPoint, MS Excel, Word documents, PPT files, images, videos, music files and many more which has blocked under BKF file format. You can also use demo version first to test the software and can use this software to get a free preview of corrupted Windows BKF files. Full version of BKF repair tool is available at just $89.