MSI MS-7145 motherboard material packed into a 2.48 MB RAR file. The name lists no revision, document type or BIOS version, so its contents must be checked after extraction. Archives like this usually contain a circuit diagram, a boardview for locating parts and test points, or an SPI BIOS dump for reflashing with a programmer. MSI prints the MS-7xxx code and a revision on the board itself. Confirm that both match before use, and check that any image is the same size as the flash chip.
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.