A schematic diagram. Shared as “PRIME A320M-K [DIAGRAMAS.COM.BR].zip” — a .zip file, 10.3 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 @bartonarquivos. 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