A boardview (component placement) file for Lenovo hardware (board NM-A581). Shared as “NM-A581 REV 3.0 BDV.rar” — a .rar file, 669 KB.
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 @pkbiosbdv. 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)