A boardview (component placement) file for Lenovo hardware (board NM-B861). Shared as “FX490 NM-B861 (REV 1.0).rar” — a .rar file, 5.21 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 @BoardSchematic. 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.