Conversion of bak files to dbx file format

In most cases, a .bak file is just a renamed version of the original file with changed extension to distinguish it from the source file. Which means that if you .bak file is indeed just a backup of some .dbx file, simple renaming is enough. Otherwise, it is unlikely can find some bak to dbx converter, so the only remaining option would be to recover the backup in the original software - and you have to know which one is that.

Open BAK file    Open DBX file