For the MSI MS-7181 motherboard, this 2.44 MB RAR archive gives no indication in its name of what it holds. Extract it to see whether it is a schematic, BIOS firmware or other reference material. The MS-7xxx pattern is MSI's own numbering for desktop boards, printed directly on the PCB along with a revision. Make sure both match your board before relying on the data, and when reflashing, read and store the current SPI or firmware chip contents so the board can be restored if something fails.
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.