Schematic package for the ASUS N56VM notebook mainboard, supplied as a PDF in a 2.23 MB RAR archive. The RG token in the name is most likely a board revision, but the name does not explain it, so confirm it against the silkscreen on your PCB. A PDF schematic opens in any ordinary viewer and is the reference for tracing power rails, signal paths and the power-on sequence. It also helps with checking a shorted line or finding the right replacement part. Board revisions can differ in their component values.
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 @LaptopsBoardview. 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.