Schematic in PDF form for a board code-named Cedar, marked as an Intel platform with board number MB13269-1 in its name. The copy suffix in the file name suggests a duplicate of another upload, so compare it with any other version you hold. Technicians use a schematic like this to follow power rails from the charger and regulators to the CPU, trace signals between chips, and identify components around a short. Any PDF reader opens it. Confirm that the number printed on your PCB matches MB13269-1 before trusting the values and part references inside.
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 @ITHINKHS. 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.