Compact RAR archive of 1.08 MB marked for the MSI MS-7170 motherboard. The name does not reveal what it contains, though the size could fit a BIOS image or a short document; extract it to confirm. MS-7 numbers form MSI's desktop board series and are printed on the PCB. Verify the number and revision first, and if you reflash the BIOS chip with a programmer, back up the original contents and confirm the image matches the chip capacity, as a mismatched file will not fit.
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.