Boardview for the MSI MS-7304 motherboard, revision 1.21 as indicated by the REV 121 marking, supplied as a 636 KB zip. A boardview shows component placement, net names and pin connections, letting you locate parts, test points and shorted nets on the physical board. Open the extracted file in a viewer such as OpenBoardView or FlexBV, depending on the format inside. MS-7xxx is MSI's desktop board numbering; ensure the revision on your PCB matches, as a separate REV 13 version also exists.
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.