Small RAR archive, 816 KB, labelled for the MSI MS-7185 motherboard. Its name carries no information about the contents, though the modest size could suit a single BIOS image or a compact document set; only extraction will tell. MS-7xxx is the MSI numbering used for desktop boards and is marked on the PCB. If you intend to flash an image from it, compare the file size with the flash chip capacity, verify the board revision, and dump the existing chip with a programmer before overwriting it.
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.