If you need to figure out what is the structure of the Data File then we can probably help you out.
We have developed our own DDF Sniffer tool to parse out unknown data files. Although we sell a number of tools for Creating DDF files and exporting data we do not sell our DDF Sniffer tool and instead only use it ourselves as part of our services.
We can help you get the DDF definition. And we do have other tools that can easily export the data into any file or database format.
http://www.classicsoftware.com