A small 56 KB PDF filed under schematics, named only 40CPQ080. The name looks like a component part code, not a motherboard number, and it states no device, brand or board revision. In practice a document of this kind serves as a quick reference for a part's pin assignment, package outline and electrical limits when you are hunting for an equivalent replacement. Any PDF viewer will open it; compare the full marking printed on the part body, since neighbouring suffixes usually mean different voltage or current grades.
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 .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.