Boardview file named GC9 in BRD format, 257 KB. The name is uninformative and states no brand, model or board number, so identify the board by opening it and reading component labels or title data. BRD layouts open in viewers like OpenBoardView or FlexBV, which show part placement, nets, pin details and test points. Technicians use them to trace a shorted rail or a broken signal. Compare the layout and markings with the actual PCB before probing or replacing parts.
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 @ITHINKHS. 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.