RAR archive of 1014 KB titled as a boardviewer package marked all ok, suggesting the uploader found it working. The name names no laptop model or board, so it most likely holds viewing software or an assorted set of layout files rather than one specific design. Boardview tools display component placement, pin nets and test points, helping trace signals and find shorted capacitors during board-level repair. Scan the extracted contents before running any executable, and check that any layout you use matches the actual PCB number.
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.