A boardview (component placement) file for Gigabyte hardware. Shared as “GIGABYTE GA-EP45-UD3R REV 1.61 (PDF BOARDVIEW).rar” — a .rar file, 132 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 @abgm_manutencao_esquemas. 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)