RAR archive for the MSI MS-7685 motherboard at revision 0B, 716 KB in size. The name does not list the contents, though files of this kind usually hold a schematic or a boardview for the board. MS-7xxx numbers are MSI's own desktop motherboard codes, so the brand and board maker are the same company here. Unpack it with WinRAR or 7-Zip and confirm the MS-7685 code and REV 0B marking on the PCB before you trace power rails, check a shorted line or look for test points.
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.