Compressed package for the MSI MS-7187 motherboard, 8.55 MB in RAR format. Nothing in the name states what is packed inside, so expect anything from schematics to firmware until you extract it with 7-Zip or WinRAR. The MS-7xxx code is the MSI pattern for desktop boards and appears printed on the PCB itself. Match it, along with the revision marking, against your board, and if a BIOS file turns up, read and keep a backup of the existing flash chip before programming the new one.
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.