A boardview (component placement) file for Apple hardware (board 820-3126). Shared as “A1311_K60_215_Mid_2011_820-3126-A.pcb” — a .pcb file, 1.41 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 .pcb file
In repair archives a .pcb is typically an XZZ (XinZhiZao) boardview — popular for phones and recent laptops.
XZZ PCB viewerOpenBoardView (recent builds)FlexBV