An archive of repair files for Apple hardware (board 820-02016). Shared as “820-02016 V1.0.zip” — a .zip file, 156 KB.
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 @Satale_bios_esquemas_Laptop. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.