A schematic diagram (board DA0QUAMB6E0). Shared as “AFS DA0QUAMB6E0 REV E PDF.rar” — a .rar file, 1.72 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)