A boardview (component placement) file. Shared as “openboardview-8.0-win32 (1).zip” — a .zip file, 1.26 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 @afssolutions. 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