Compact 4.04 MB zip archive for the ASUS A43S laptop, with nothing in the name indicating the board revision or the exact contents. It could hold a schematic, a boardview, a firmware dump or several of these, so extract it and identify each file by extension. Before trusting any diagram, compare the revision silkscreened on your mainboard with the one shown in the documents. For firmware, read and save the existing SPI chip contents with a programmer before writing anything, and check that the image size equals the flash capacity.
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 @azvoltagemap. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.