RAR archive of 1.18 MB for the MSI MS-7419 motherboard. The name gives only the brand and board code, so it is not clear whether it holds a schematic, a boardview or a BIOS dump. MSI's MS-7xxx numbers are printed on the PCB and should be checked, together with the revision, before using these files. Diagrams help with measuring voltages, tracing signals and finding shorted parts. Before flashing any image from the archive, back up the existing SPI chip contents.
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.