An archive of repair files (board LA-D704P). Shared as “BDL50 LA-D704P (REV 4.0) (2016-06-15).rar” — a .rar file, 10.3 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 @Satale_bios_esquemas_Laptop. 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)