Schematic for the ASUS A7V8X, provided as a large PDF of about 9.69 MB. The name gives the model only, with no PCB revision, so compare the revision printed on the board before using values from the drawing. A diagram like this is used to trace the CPU voltage regulator, memory and chipset supplies, check signals between slots and controllers, and find the component responsible for a short or a no-power fault. Any PDF reader opens it, though the size may make page loading slower on older machines.
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 @hrtechno. 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.