Archive for the X450LD at revision 2.0, which looks like an Asus notebook mainboard revision, at only 152 KB. The name does not say whether the RAR holds a boardview, EC code or another small firmware file, so inspect it before relying on it. Files of this kind are used to locate components and test points or to restore a controller chip. Match the 2.0 revision silkscreened on the board, since neighbouring revisions can differ in layout, and save any chip contents before writing new data to it.
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.