RAR archive, 4.05 MB, for the MSI MS-7091 motherboard. Only the maker and board number are given, so the exact contents and the revision covered are unknown until it is extracted. MSI marks its desktop boards with MS-7xxx codes, normally printed on the PCB between slots or near the edge. Use the documents inside for tracing rails, checking shorts or restoring firmware, but first verify the board revision, and if flashing, back up the original SPI chip with a programmer.
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.