A 4.15 MB zip archive tied to the MSI MS-6722 motherboard, the largest file in this part of the MS-67xx series. No revision or document type is given in the name. Larger archives like this one often carry a full schematic set, which a technician uses to locate test points, check a shorted rail back to its source and identify replacement components. Verify the MS- number and the version printed on the PCB, since MSI frequently revised boards under the same project code.
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