A boardview (component placement) file (board LA-D871P). Shared as “BAL60 LA-D871P - BOARDVIEW REV. 1.0.zip” — a .zip file, 7.32 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 @abgm_manutencao_esquemas. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip