Schematic in PDF form labeled Quanta G3EC, about 2.02 MB, with no laptop brand, board number or revision stated. G3EC appears to be a Quanta project code, which on Quanta boards usually forms part of the DA0 board number printed on the PCB. Any PDF reader opens it, and the pages serve to trace power rails, follow signal paths and identify regulators and their expected outputs when diagnosing a fault. Confirm the project code silkscreened on your motherboard matches before measuring.
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 @notebookschematic. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.