MSI MS-7418 motherboard schematic at revision 0C, supplied as a PDF of roughly 950 KB. Being later than the 0A drawing of the same board, it may include changed parts or values, so confirm the revision marked on the PCB first. Technicians use it to trace power rails from the input connector through the regulators, follow power-on signals, check connector pinouts and find components when hunting a short. MSI uses this MS-number format for its own boards. Open it with any PDF viewer.
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.