Zip archive of 573 KB intended for the Gigabyte GA-H61M-S, an Intel H61 desktop motherboard. The name gives no revision and does not say what is inside, so the contents, whether firmware or service documents, must be checked after extraction. Gigabyte boards carry the revision on the silkscreen, usually near the expansion slots, and that should be compared before use. If the archive holds a BIOS image for SPI programming, confirm the size matches the chip and dump the original contents as a backup.
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.