ZIP archive for the MSI MS-7733 desktop motherboard, revision 4.0, about 655 KB. The name does not list what is inside, so extract it to see whether it holds a schematic, boardview or similar repair data. A rev 2.0 package for the same board is listed separately, and the two revisions may differ in layout and components, so read the revision silkscreened on your PCB first. Once matched, the material helps trace power rails, check VRM and chipset supplies and locate faulty parts.
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.