The earliest revision in this set, MSI MS-7B79 REV 1.0, provided as a boardview in a RAR archive of 2.77 MB, noticeably larger than the later revision files and possibly holding extra material. MSI uses the MS-7Bxx pattern for its own desktop boards. Use the layout to identify components, follow nets between chips and connectors and locate measurement points during short or no-power diagnosis. Unpack it and open the content in a boardview viewer, and verify the PCB is truly revision 1.0 before trusting part positions.
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 @BoardSchematic. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.