EPM: Edit basefiles outside of the web interface

I have a basefile that I need to add over 100 lines of data to. Doing it one line at a time and waiting for the page to refresh each time is going to take for ever. Can I edit these files directly somewhere on the filesystem of the PBX? Where are they stored?

I know this is an old question but if anyone figured it out I would be happy to know how to do it.