A schematic diagram for MSI hardware (board MS-16JC, MS-179C). Shared as “MS-16JC_ MS-179C (GE62, GE72)_((HM170)) PDF.rar” — a .rar file, 4.20 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 @alischematics. 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.