A boardview (component placement) file for HP hardware (board DAG74AMB8D1). Shared as “HP G74A DAG74AMB8D1 REV D G74A-C (BDV).brd” — a .brd file, 312 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 @alischematics. 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)