Archive of 3.06 MB associated with Z580 and the number 20135, which matches the name of the Lenovo IdeaPad Z580 and possibly a machine type or board identifier, though the name does not say what the contents are. It may hold a BIOS image, schematic or boardview, so extract and inspect it first. If it contains firmware, verify the board number and revision on the PCB, back up the original chip and check that the image size fits the flash before programming.
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.
Built-in OS tools7-Zip