Check out some options how bak files might be converted to csv format.
Some BAK files may be CSV files that were renamed for backup purposes. You can recognize these when you open these using text editor and see data in comma separated value format. Otherwise, you would need to recover the .bak file in the original software before you can access the data for possible CSV export.
Updated: September 6, 2016
Unfortunately, there is no detailed software record in the database for this conversion.
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