ZIP archive of about 5.4 MB labelled only with the ASUS model code X509JA, a VivoBook laptop name, and nothing else on its contents. It could hold a BIOS image, schematic or boardview, so open it and check what is inside before planning any work. If it carries a firmware dump, compare the board number printed on the motherboard and the flash chip size before writing it. For a schematic or boardview, confirm the board revision so that rails, test points and parts line up with your unit.
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 @BiosSchematicWorld. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.