Boardview in BDV format, about 1 MB, for the X63C main board, revision C according to the name; X63C is the Quanta project code linked to the HP ProBook 450 G3. BDV files open in boardview viewers such as FlexBV or OpenBoardView-type tools and show part placement, net names and pin connections, which speeds up locating test points, tracing a rail to its source and finding a shorted capacitor. Make sure the revision on your PCB matches before trusting 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 @LaptopsBoardview. Enginerys does not host this file.
How to open a .bdv file
Text-based boardview produced by Honhan / Hon Hai test tooling, with lightly obfuscated content.