Boardview for the ASUS X555LD laptop motherboard, compressed into a 136 KB ZIP. A boardview maps the physical layout, showing every component, its reference designator, pin nets and test points, which speeds up locating a shorted capacitor or checking continuity between parts. Files of this kind open in viewers such as OpenBoardView, FlexBV or Boardviewer, depending on the inner format. The name gives no board revision, so compare the layout and markings with your PCB before trusting part positions.
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.