I have a client who has about a huge (160GB) binary blob of a backup file ending in .bkf which wouldn’t be terribly interesting except that their old hardware supplier managed to nuke about 100GB of data at some point and this is the only possible backup.
Problem: Windows ntbackup.exe won’t open it, reporting it as corrupt.
Possible answer number 1: Pay USD $89 for some weird proprietary commerical app (google for bkf file recovery) which seems to work reading the file as it shows relevant data
Correct answer number 2: cp the file across to a linux partition, install mtftar (needs compile unfortunately as no distros seem to package it) then recover required files. Cashback!