A schematic diagram (board DA0ZQ9MB6C0). Shared as “AFS DA0ZQ9MB6C0 REV C PDF.rar” — a .rar file, 1.26 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 @afsbiosfree. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)