An archive of repair files for Lenovo hardware (board NM-C221). Shared as “NM-C221 N18E-G0-A1.zip” — a .zip file, 736 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 @boardsscanrepo. 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