A 1.83 MB zip archive tied to the MSI MS-6561 motherboard. Only the board code is given, so the revision, chipset and archive contents need to be checked after extraction. MS numbers are MSI's internal project identifiers and are silkscreened on the board, usually near the expansion slots. Typical uses include reading a schematic to locate a shorted rail or missing voltage, or reflashing a damaged BIOS chip. Back up the existing chip contents before programming, and match the PCB revision to the documents.
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.