MSI MS-7716 motherboard archive, revision 1.0, packed as RAR at around 848 KB. The name offers nothing beyond the board number and revision, so check the extracted contents to see whether it is a schematic or boardview. The MS-7xxx code identifies an MSI-designed desktop board. Make sure the revision on the PCB matches 1.0 before working from it, as layouts and component values can change between versions. The material serves for tracing rails, checking the VRM and locating shorted or open components during repair.
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.