A 162 KB PDF labelled 48CTQ060 and catalogued as a schematic, giving no laptop model or board revision. The name reads like a semiconductor part code and is the base variant of the 48CTQ060L document, so the content is most likely a datasheet. Technicians open such a file in a PDF viewer to check pin assignment, package dimensions and electrical limits when testing for a short or sourcing a spare. Verify the marking on the component before relying on the ratings.
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.