RAR archive (about 1.42 MB) for the MSI MS-7012 motherboard. Nothing beyond the board number appears in the name, so the revision and file types must be checked after extraction. Common contents are schematics for tracing power and signal faults, boardviews for locating components and test points, or BIOS files for chip reprogramming. MS-7xxx is how MSI numbers its own boards, printed on the PCB. Make sure the number and revision match your board, and back up the original firmware before any write.
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.