Zip archive for the MSI MS-6568 board, 904 KB in size. The name gives only the MSI project number, so the contents are not stated; a package of this size could hold a schematic PDF, a BIOS image or both. MS-numbers are MSI's own internal board codes, printed on the PCB near the slots or along an edge, and the MS-65xx range belongs to MSI's older desktop motherboard generation. Open the archive and confirm what it actually contains, then check the board number on your PCB before relying on any file.
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.