MSI desktop motherboard schematic for board MS-7302, revision 1.1 according to the file name, supplied as a 1.27 MB PDF. MS-7xxx is MSI's own numbering for desktop mainboards, and the revision suffix matters because component placement and rail design can change between issues. Technicians use a diagram like this to trace VRM and standby power rails, follow reset and power-on signals, and identify parts around a shorted line. Confirm the MS-7302 number and version silkscreened on the PCB before trusting values here.
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 @pepeelectronica. 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.