Boardview covering the ASUS K40C and K50C notebooks, mainboard revision 2.0, supplied as a 1.56 MB RAR archive. These two models share one board design, which is why the name lists both. The layout data shows part outlines, designators and net connections, so you can find a shorted capacitor, measure test points and follow a signal across the board. Extract it and load it in a boardview viewer. Confirm that the PCB carries revision 2.0 before relying on component positions.
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 @boardview. 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.