Boardview in a RAR archive for Wistron board 08212, revision 1, around 118 KB. Wistron, the board maker, numbers its motherboards with five digits followed by a dash revision. The extracted file opens in boardview software such as OpenBoardView or FlexBV, showing component outlines, nets and pin connections, which helps locate parts, test points and the path of a shorted rail. Since revisions 2 and 3 of the same board also exist, check the PCB marking reads 08212-1.
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.