An archive of repair files for MSI hardware (board MS-15421, MS-17K21). Shared as “MS-15421_GN20-E5-A1_RTX3070.rar” — a .rar file, 385 KB.
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)