A boardview (component placement) file. Shared as “BoardViewer abre extensão .TVW 2.0.1.9 (Beta).rar” — a .rar 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 @bartonarquivos. 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)