How can I open .DB7 data files?

I've got a bunch of files with DB7 extension, coming from a customer's software. Each one of them is related to a database table. What I want is to export data in a more practical format, such as CSV开发者_开发问答.

Reading the header of the file, something addressed me to NexusDB, but I can't manage opening these files. Do you have any suggestions about that?

---

If you are using Windows and have Microsoft Access, you can download the NexusDB ODBC driver and create a linked table in Access. You can then use Access to export to CSV.