MSI MS-7051G archive, 1.24 MB in RAR format. The trailing G marks a variant of the MS-7051 design, but the name does not explain what that variant differs in, nor does it give a revision or list the contents. MSI's MS-7xxx codes identify its own desktop motherboards and are printed on the PCB, so make sure the board reads MS-7051G rather than plain MS-7051. Extract with 7-Zip or WinRAR, and back up the original flash before writing any firmware found inside.
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 @IT_SERVICE_WORLD. 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)