Windows BKF files created using NT Backup utility is prone to corruption and this can make the file inaccessible.
But you can easily repair the file and recover all the maximum possible data from it as BKF files stores the most important data in it. Here is effective and useful BKF file recovery tool.
it is an excellent product which easily repairs BKF file in one cycle and remove all the errors and corruptions. Now the software support with windows 7 and other versions.Just download trial
version information from here:- http://www.filesrecoverytool.com/bkf-recovery-tool.html