Small 124 KB PDF titled DMI process, catalogued as a schematic, but the name does not identify any device, board or brand. DMI in a repair context usually refers to Desktop Management Interface data, such as serial number, model and UUID stored in the BIOS, so this may be a guide to restoring those fields rather than a circuit diagram. Technicians restore DMI after flashing a generic dump. Open it in any PDF viewer and check whether its procedure suits your platform and tools before following it.
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 @biosschematics. 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.