A boardview (component placement) file for Apple hardware (board 820-1970). Shared as “820-1970 LIO.bv” — a .bv file, 288 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 @ShareMan_Electronic_Files. Enginerys does not host this file.
How to open a .bv file
Older ATE boardview format, usually found for legacy laptop and desktop boards.
OpenBoardViewBoardViewer