ZIP archive of 665 KB for the A760D3 motherboard, revision V1 as indicated in the name. The contents are not described and could include a firmware image, schematic or service documentation. Open it with any common archive tool and inspect the files. Check that the board version silkscreened on the PCB matches V1, as other revisions may differ. Before writing a BIOS image, back up the original flash chip with a programmer and confirm the dump size equals the chip capacity.
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.