Circuit diagram for the MS-7392 motherboard, marked V21, which most likely means version 2.1, provided as a PDF of about 1.23 MB. The MS-plus-four-digit pattern is the one MSI uses for its desktop mainboards. Technicians use these sheets to trace power rails, check the CPU VRM and standby circuits, and locate components on a shorted net. A version 2.2 schematic of the same board is also listed, so compare the revision on the PCB before relying on designators.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)