An archive of repair files for MSI hardware (board MS-15431). Shared as “MSI GP66 Leopard MS-15431 SRKT3 GN20-E5-A1.rar” — a .rar file, 34.0 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.
7-ZipWinRARThe Unarchiver (macOS)