MSI MS-6549 files bundled into a 3.33 MB zip archive. The name provides no revision, chipset or content information, so the archive must be opened to see what it includes. MS-65xx is part of MSI's internal numbering for older desktop mainboards, and the code is printed on the board. A technician would use such material for circuit tracing, short diagnosis or BIOS recovery via a programmer. Verify the PCB revision, and if firmware is included, confirm its size matches 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 .zip file
Compressed archive that every operating system opens without extra software.