A schematic diagram for Apple hardware (board 820-3299). Shared as “Apple iMac 27 A1419 D8 MLB ULTIMATE-820-3299 schematic.zip” — a .zip file, 8.79 MB.
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 @abgm_manutencao_bios. 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