Revision 3.1 schematic for the MSI MS-7388 desktop motherboard, provided as a 1.03 MB PDF that any standard reader can display. Being a later revision, it may reflect design changes compared with earlier MS-7388 documents, so the version silkscreened on the board should match before you take component values from it. Technicians typically consult such diagrams to trace power rails from the ATX connector, debug no-POST conditions, check clock and reset lines and identify replacement parts for damaged VRM sections.
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.