Boardview in .brd format, 286 KB, for board 09207 marked sa, the counterpart of a separate sb file, and no brand or model is named. The suffix likely distinguishes board variants or sides, so verify against the markings on your actual PCB before trusting the placement. Load it in a viewer such as OpenBoardView to search for components, highlight a net across the board and find convenient probing points when diagnosing missing voltages or shorted rails.
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 @one5technology. 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.