A boardview (component placement) file (board LA-K452P). Shared as “LA-K452P (BDV)(.CAD) (3).rar” — a .rar file, 433 KB.
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 @bartonarquivos. 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)