RAR archive, 1.29 MB, for MSI board MS-7043. The name lists just the model code and no revision, chipset or file description, so inspect the contents before relying on them. MS-7xxx is MSI's desktop motherboard numbering, and the matching code and revision should be visible on the PCB silkscreen. Use any schematic inside to locate components and trace rails; for firmware, back up the original flash chip first and confirm the image is the same size as the chip.
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)