MSI MS-7673 motherboard, revision 2.0, in a 986 KB RAR archive. The name gives only the board code and revision. Packages like this usually contain a circuit schematic and sometimes a boardview for component placement. Open the archive with 7-Zip or WinRAR, then compare the PCB silkscreen with the documents, because revisions of the same MSI board can use different parts and routing. Use the schematic to identify rail names, expected voltages and the parts to measure while diagnosing a dead or unstable board.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.