A boardview (component placement) file. Shared as “GI5CNXA_MB_VB2_20180110_0900-Final_OP.brd” — a .brd file, 42.1 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 @ShareMan_Electronic_Files. Enginerys does not host this file.
How to open a .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.
OpenBoardViewFlexBVBoardViewerAllegro Free Physical Viewer (Allegro .brd only)