A boardview (component placement) file (board DALZ3AMB8E0). Shared as “DALZ3AMB8e0 rev e.bdv” — a .bdv file, 1.05 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 @sboisworld. Enginerys does not host this file.
How to open a .bdv file
Text-based boardview produced by Honhan / Hon Hai test tooling, with lightly obfuscated content.
OpenBoardViewFlexBVBoardViewer