A schematic diagram for Lenovo hardware (board NM-D521). Shared as “NM_D521_Rev_1_0 AMD PDF.rar” — a .rar file, 4.23 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 @alischematics. 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)