A boardview (component placement) file (board LA-E791P, LA-E801P). Shared as “LA-E791P LA-E801P REV;2.0.zip” — a .zip file, 277 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 @pkbiosbdv. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.