A boardview (component placement) file for Apple hardware (board 820-4668). Shared as “A1418_iMac_21.5-inch,_Mid2014_820-4668-A.pcb” — a .pcb file, 1.19 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