Boardview for the MSI Megabook S420, board MS-1412, revision 1.1, packed as RAR. MSI numbers its own boards with the MS- prefix, and the number plus revision appear on the PCB silkscreen. The layout is useful for identifying components by location, following nets and finding test points when chasing a dead or shorted board. Extract the archive and open the file with a viewer such as OpenBoardView, FlexBV or Boardviewer. Check that the revision reads 1.1 on your board, as layout details can vary.
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 @BoardSchematic. 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.