A schematic diagram for MSI hardware (board MS-16K4, MS-17B4). Shared as “MSI MS-16K4 MS-17B4 0A Schematics(PDF)PK.pdf” — a .pdf file, 1.50 MB.
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 @pkbiosbdv. 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.