A boardview (component placement) file for ASUS hardware. Shared as “BOARDVIEW ASUS_X451MA_MB REV 1.1 & 2.1.rar” — a .rar file, 209 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_bios. 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)