This 462 KB ZIP archive is identified only by the motherboard model DG31GL. Its contents are not described in the name; they may include a firmware dump or service documentation for the board. Use any common archive utility to open it and review what is inside. When reflashing a BIOS chip from it, read and keep the original contents with an SPI programmer, check that the image size matches the flash capacity, and make sure the board model and revision on the PCB correspond to the file.
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 @laptopchiplevelrepair. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.