Boardview in .brd format for the Apple 820-02935 logic board, with the -05 suffix that indicates the board build revision. The file maps every part, pad and net, so a technician can find the components on a rail with a short, locate test points and confirm which pins share a signal. Viewers such as FlexBV and OpenBoardView read most .brd boardview variants. Use it together with the 051-08286 schematic for this board, and check that the 820 number and suffix printed on your logic board agree before measuring.
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 @notebookschematic. 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.