MSI MS-7124 resources compressed into a 4.01 MB RAR archive. The name states only the brand and board number, with no revision or document type. Open it with WinRAR or 7-Zip to find out whether it contains diagrams, a boardview or BIOS files. MSI desktop motherboards carry MS-7xxx codes printed on the PCB, usually alongside a revision number. Compare these before relying on the contents, and dump the existing BIOS chip first if you plan to reprogram it.
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)