This is just a bit of guess work.
If the database really is a C++ database it probable consists of one or more binary files written by the C++ program (although if you're really lucky they could be in simple text format).
Try opening one of the files with WordPad, or even Word. If the company haven't done their job properly you may be able to see the data. Then it's just a case of working out the file delimiter characters, or how many characters per record (or field).
Good luck
