Packed as a 1.57 MB RAR, this file covers the MSI MS-7681 desktop motherboard, revision 0A. The name says nothing more about the contents. Archives filed under an MSI board code typically carry the schematic PDF, a boardview or both. MSI uses the MS-7xxx pattern for its own desktop boards, and the number is silkscreened on the PCB near the slots. Check that both the board code and REV 0A match your board before using it to follow VRM phases, standby rails or the power-on sequence.
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.