Small 710 KB RAR archive for the MSI MS-7157 motherboard. Its name is uninformative about the contents; a file of this size might be a single BIOS image, but only extraction will confirm. MSI's MS-7 numbering identifies its desktop boards and is printed on the PCB. Compare that number and the revision with your board, then if reflashing, read the original chip with a programmer, keep the backup, and make sure the image matches the flash chip size before writing.
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)