Zip archive of 4.12 MB labelled for the MSI MS-6540 motherboard. The name carries no information beyond the brand and MSI's internal board number, so contents and revision are unknown. MS-xxxx codes are silkscreened on MSI PCBs, which makes matching straightforward. Depending on what is inside, use it to locate components and test points, check voltage regulator circuits, or restore a corrupted BIOS with a programmer. Check the revision first and back up the existing firmware before writing.
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 .zip file
Compressed archive that every operating system opens without extra software.