A schematic diagram for Dell hardware (board LA-8241P). Shared as “Inspiron 5520_7520 LA-8241P PDF.rar” — a .rar file, 1.55 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 @laptopchiplevelexpert. 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)