Boardview in BRD format for a board identified only as R23-MB-D, compressed in a 128 KB RAR archive. The name does not state the brand, device model or revision, so verify the code against the PCB before use. BRD layouts show component outlines, part designators and net connections, helping locate test points and trace a shorted rail back to a faulty component. Programs such as OpenBoardView, FlexBV or Boardviewer can open this format once extracted.
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 @schematicslaptop. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)