A boardview (component placement) file (board LA-L946P). Shared as “HDL5A LA-L946P Rev 1.0 BDV.rar” — a .rar file, 104 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 @pkbiosbdv. 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)