An archive of repair files (board LA-D704P). Shared as “BDL50 LA-D704P (REV 4 (1).0).ZIP” — a .zip file, 9.44 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 @one5technology. 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