MSI MS-6567 material packed into a 4.46 MB zip archive, with no further detail in the name about revision or contents. MSI uses the MS-xxxx code as its internal board identifier, and the MS-65xx series covers older desktop mainboards. A technician would typically use such a package for schematic tracing of power rails and signals, or for a BIOS image to reflash the firmware chip with a programmer. Compare the silkscreened model and revision on the board with the documents inside, and back up the original chip before writing anything.
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.