RAR archive of 1.79 MB labelled with Apple model A1425, the identifier used for the 13-inch MacBook Pro with Retina display; the name does not reveal whether it holds a schematic, boardview or both, nor the logic board number. Repair files for this model are typically used to trace power rails, check the SMC circuitry and locate components. Extract it to see the contents, and match the 820- logic board number printed on your board against the document before measuring or replacing parts.
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 @cyberlanelectonik. 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.