RAR archive of 959 KB named for MSI 7031, which corresponds to the MS-7031 number in MSI desktop motherboard range. No revision or chipset is stated. The content is likely a schematic used to trace CPU VRM output, memory and chipset supplies, the ATX power-on circuit and reset logic on a board that fails to start. Make sure the MS-7031 marking and revision silkscreened on the motherboard match the documents, as MSI released multiple revisions of many desktop designs.
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 @generalschematics. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.