Notebook schematic for the MSI MS-16J91 mainboard, supplied as a 1.52 MB PDF with no revision stated in the file name. The MS-16xx pattern is MSI's numbering for laptop boards, and this kind of diagram is used to follow DC-in and charging paths, check standby and main rails, and identify parts around a short to ground. Any PDF viewer opens it. Because the revision is not stated, compare the drawing's title block with the marking on the PCB before relying on part values.
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 @pepeelectronica. 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.