A boardview (component placement) file (board 6050A3087503). Shared as “VELLFIRE-6050A3087503-MB-A01.pcb” — a .pcb file, 2.03 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