Compressed package for the Gigabyte GA-H61M-DS2 motherboard, Intel H61 chipset, 564 KB in size. No board revision appears in the name, which matters because this model exists in several revisions with different files. The content type is not indicated, so extract it to see whether it is a BIOS dump or repair documentation. Before flashing a firmware image with a programmer such as a CH341A, read and save the existing chip, and confirm the image size fits the flash part on your board.
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 @schematicslaptop. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.