Boardview for an HP board labelled only R13-B, in BDV format inside a 328 KB RAR archive. The name gives no laptop model or ODM board number, so identify the actual board before relying on it. BDV boardviews map component positions, nets and test points and open in viewers such as Boardviewer or FlexBV. A technician uses one to find parts referenced in a schematic, check continuity between pins and track down shorted rails. Compare the outline and markings with the real PCB to confirm.
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 @cyberlanelectonik. 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.