Small 112 KB RAR archive labelled only as MacBook 466, Apple brand. The name gives no logic board number, revision or model year, so the number 466 alone does not identify the exact board and the contents should be inspected after extraction. At this size it likely holds a compact document such as a boardview or a short schematic set rather than a full service package. Before using it for repair, match any 820-xxxx board number found inside against the marking printed on the PCB to avoid working from the wrong circuit.
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 @generalschematics. 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.