A schematic diagram for Lenovo hardware (board NM-A531). Shared as “BX260 NM-A531 PDF .rar” — a .rar file, 2.84 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 @generalbios. 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)