Documentation archive for Apple board 820-2915, packed as a 1.89 MB RAR without further details in the name. No model, revision or content type is stated, so open it to see whether a schematic, a boardview or both are included. Apple numbers its logic boards in the 820-xxxx pattern, and the matching number plus revision letter on the PCB is the first thing to verify. Once confirmed, the pages help with tracing rails from the charger circuit onward, checking component values and locating measurement points.
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 @Mac_Shematic_Santale. 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.