Boardview for the Apple A1534 MacBook, logic board 820-00244, revision 08, in BDV format inside a small 67.3 KB RAR archive. Apple numbers its logic boards 820-xxxxx, printed on the PCB. A boardview shows the physical position of parts, nets and test points, so a technician can locate components and probe signals quickly while following a schematic. BDV files open in boardview software such as OpenBoardView or FlexBV. Confirm the 820 number and revision on the board match.
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 @pkbiosbdv. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.