A boardview (component placement) file (board LA-6931P). Shared as “LA-6931P-Rev 1.0.bdv.zip” — a .zip file, 443 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 @SCHEMATICWORLD. Enginerys does not host this file.
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Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip