A boardview (component placement) file (board 203088-3). Shared as “Wistron LAR-2 CZ 203088-3.rar” — a .rar file, 2.50 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.