A 5.64 MB RAR archive labelled MSI MS-7175. The file name identifies the motherboard but says nothing about the documents or firmware packed inside, so check after extraction with WinRAR or 7-Zip. MS-7xxx is the pattern MSI uses for desktop boards, with the number printed on the PCB. Schematics from such a set help locate components and trace rails during fault finding; a BIOS image should only be flashed after the board revision is verified and the original chip has been read and archived.
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.