A boardview (component placement) file for MSI hardware (board MS-16R51). Shared as “MS-16R51 VER 1.0 BOARDVIEW (BDV)(.cad) .zip” — a .zip file, 227 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 @generalbios. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip