A schematic diagram for Sony hardware (board DA0HKAMB6D0). Shared as “SONY DA0HKAMB6D0 - Quanta HKA - HKB PDF .rar” — a .rar file, 1.48 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 @generalbios. 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)