BoardView 2 program in a compact 50.6 KB RAR, an older lightweight viewer rather than a specific board's layout file. Such early viewers open basic .brd boardview files and display part outlines, pins and nets so a technician can trace a signal or locate a test point. Its small size suggests limited format support compared with newer tools like OpenBoardView, so expect some files not to open. Keep it as a fallback, run it on Windows, and scan the executable before use.
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 @biosarchive. 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.