.GDIAGRAMSTYLE File Extension
File TypeOmniGraffle Diagram Style File
What is a GDIAGRAMSTYLE file?
Settings file used by OmniGraffle, a diagramming application used for capturing ideas and business concepts; acts as a theme file for a new diagram and contains the default colors and styles for the diagram.
Several preinstalled digram styles are included with the OmniGraffle software installation.