.ARTB File Extension
File TypeArtboard Document
What is an ARTB file?
Vector drawing created by Artboard, a program used to make vector illustrations; may be a custom drawing or a drawing created from one of the various templates included with the software; can be exported to .PDF, .JPG, .PNG, and .TIF formats.
Artboard documents are saved in the Mac OS X package format. They include an Artboard .DRAWING file and other package files.