Compressed ZIP package for the ASUS UX561UAR laptop mainboard, revision 2.0, weighing about 3.95 MB. The name does not list the contents, but archives of this kind usually hold a schematic PDF and sometimes a boardview file for the same board. Technicians use such material to trace power rails, follow signal paths and find test points when diagnosing a no-power or short condition. Before relying on it, confirm that the revision silkscreened on the PCB reads 2.0, since ASUS layouts can change between board 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 @ITHINKHS. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.