Small RAR archive of about 474 KB associated with the ASUS H61M-E desktop motherboard, an Intel H61 chipset board. The name does not say what is inside, so it may be a BIOS image, a schematic or tool files; open it before planning work. If it contains firmware, it would be written to the SPI flash with a programmer such as a CH341A to revive a board that no longer posts. Verify the exact model and revision printed on the PCB and save the original chip contents before writing anything.
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 @laptop_bios_schematic. 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.