A 3.22 MB RAR archive for MSI board MS-7409. The name gives just the brand and board code, so it could hold a schematic, a boardview or a BIOS dump. MSI uses MS-7xxx numbers for motherboards of its own design, printed on the PCB silkscreen. Check that number and the revision on the board before relying on the files. Technicians use such material to trace standby power, check VRM outputs and locate test points. Back up the original SPI flash before writing any firmware.
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.