A boardview (component placement) file (board DA0PAKMB6F0, DA0PAKMB6F1). Shared as “DA0PAKMB6F0 DA0PAKMB6F1 Quanta 0PAK Da0pakmb6f0 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 @BoardSchematic. 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)