ZIP archive for the Gigabyte GA-B75M-S motherboard, a micro-ATX desktop board based on the Intel B75 chipset. The name gives only the model, so whether it holds a BIOS dump, schematic or other repair material needs to be verified after extraction. For a firmware image, read and store the original SPI flash contents with a programmer before writing. Check that the file size equals the chip capacity. Also make sure the board revision marked on the PCB corresponds to the data, since revisions can use different parts.
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.