An archive of repair files for MSI hardware (board MS-15831). Shared as “ms-15831 r1.0 msi gl76 12uek scan.rar” — a .rar file, 9.23 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 @boardsscanrepo. 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.