Archive tied to Apple board number 820-3024, packed as RAR and roughly 1.15 MB. Nothing else is stated in the name, so revision, model and whether it contains a schematic, boardview or both remain unknown until unpacked. Apple prints 820-series numbers on its logic boards, and a technician should compare that marking against this file first. Schematic PDFs open in any PDF reader for tracing rails and signals, while boardview formats open in tools like OpenBoardView or FlexBV for locating parts and test 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.