Small 132 KB RAR archive labelled for the ASUS BU201LA with a 1.1 tag, most likely a board revision, though the name does not confirm the contents. Archives of this size in repair collections often hold a boardview or similar layout data, which helps locate components, test points and shorted rails. Open it first to check what format is inside and which viewer it needs. Before relying on it, confirm the revision printed on your mainboard is 1.1, since layouts differ between revisions.
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.