ZIP package, 649 KB, named for the A780L3C motherboard. The name does not reveal the contents, which could be a firmware image, schematic or similar service data. Open it with 7-Zip, WinRAR or another archiver and check each file. Board-specific archives like this are commonly used to recover a board with a damaged BIOS using an external SPI programmer. Save a backup of the original chip before writing, verify the image size equals the chip capacity, and match the PCB model.
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.