Schematic in PDF form for a board named G41M01, about 1.05 MB, with no brand or revision stated in the name. The G41 token indicates an Intel G41 chipset desktop design. Technicians use such diagrams to trace a missing rail back to its regulator, identify the parts in the CPU power stage and follow power button and reset signals through the Super I/O. Because the name is sparse, read the title block inside the PDF and match it with the markings on the motherboard before using it for repair.
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 @Datalvela_servicios. 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.