BIOS package for a board identified as DP55KG, a designation matching an Intel desktop board on the P55 platform, in a ZIP of about 2.59 MB; the sb_wg suffix is not explained by the name. Such an archive is used to restore or update firmware, either through the vendor flash utility or by writing to the SPI chip with a programmer. Before flashing, back up the existing chip, verify the board model printed on the PCB, and make sure the image size matches the flash.
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 @biosarchive. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →