PCB Artist Gerber File Naming Convention

Howdy,

Does anyone know the naming convention used in the actual Gerber files you get back from Advanced Circuits after they make a file from PCB Artist? They don’t use standard extensions:

d.ger

drp.gdr

drp.ger

l1.ger

lb.ger

m1.ger

m2.ger

s1.ger

u.ger

I’m going to make a few best guesses, change the name, then load the file into Camtastic to see if it makes sense. If anyone has the info, I’d really appreciate it. I’ve sent them an email, but I haven’t heard back yet.

Thanks in advance!