Compressed package for MSI board MS-6700, about 2.29 MB. The file name states only the model number, with no revision or document type, so open the zip to see whether it holds a schematic, a BIOS file or utilities. MSI prints the MS- code on its own PCBs, so compare it with the silkscreen first. When the archive contains a BIOS image, check that its size matches the flash chip and dump the existing chip with a programmer before writing, so a working copy is always on hand.
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.
Built-in OS tools7-Zip