Boardview in .brd format for the Quanta GC6A motherboard project, around 250 KB. Only the project code is given, with no full board number, revision or laptop brand, so confirm GC6A against the PCB marking first. Viewers such as OpenBoardView, FlexBV and BoardViewer read this format and display component outlines, pin names and nets for both board sides. Technicians use it to find where a part sits physically, trace a net to nearby test points and isolate shorted capacitors once a schematic has identified the failing rail.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @pepeelectronica. Enginerys does not host this file.
How to open a .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.