Based on a bit of a Google search, ending up here, it seems that The *.dbc that NI is referring to is a CANalyzer database file, the CANalyzer *.dbc file is very common for most of their software products -- although this comment is from 2004.

There's nothing in CPAN for CANalyzer, so you may be on your own for a module that will access a CAN database. Or, it could be that you could get a developer to write you a module -- depends how useful that would be for you.

Good luck!