MSI MS-7129 motherboard archive, 5.82 MB, in RAR format. The model number is the only detail the name carries, so the package could hold schematics, boardview data, BIOS images or a combination. Unpack it and check each file against the PCB. MSI's MS-7xxx numbering identifies its desktop boards, and the revision printed next to it matters when comparing layouts. Before programming the BIOS chip, take a full backup and make sure the image size matches the flash chip.
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.