.GBO File Extension
File TypeGerber Bottom Overlay Data File
What is a GBO file?
Data output file created by Printed Circuit Board (PCB) CAD tools such as Autodesk EAGLE and used by PCB manufacturing machines to designate layouts of electrical connections; contains layout data for bottom silk screen layers; written in RS-274X, which is the most common and contemporary Gerber format.
The GBO file acts similar to a .PDF file. It is an exported version of the PCB layout and is meant to be viewed and referenced but not edited.
NOTE: The Gerber format was originally developed by Gerber Systems but is now maintained by Ucamco.
[projectname].gbo - The GBO file is named after the name of your PCB project.