I'm using Backup Exec 2012 (Symantec) to take backup of my computer data. A couple of weeks ago I made a 20GB of .bkf file. The file was split into five parts, i.e. 4GB each. The file was fine till last week as I updated it. But now when I try to open the file, it can't be opened and I receive this error: "Backup Exec fails performing a backup operation and encounters corrupt files". I tried some third-party apps to recover my data from it, but none of them supported recovery of a split .bkf file. The file is very crucial for me, so I can't afford any type of data loss. Please suggest me something to fix this problem.