ZIP archive of 1.62 MB labelled only with the Lenovo G570 model name, without any indication of what it holds. It might contain a BIOS dump, schematic, boardview or other service material, so open it and check the contents before planning a repair. If it is a firmware image, back up the original SPI chip before writing anything. If it is a diagram, compare the motherboard number printed on your board with the one in the documents, since the G570 was produced with more than one board design.
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 @laptop_bios_schematic. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.