Small 122 KB RAR archive labelled only with Q502LA and 1.1, which most likely refers to the ASUS Q502LA notebook and a board revision 1.1, though the name does not confirm the content type. Given its size it could hold a boardview or an EC firmware rather than a full BIOS, so open it to check. Boardview files help locate components and test points, while firmware needs a backup of the original chip before writing. Verify the revision marked on the PCB before relying on 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.