Archive for the Apple A1278 MacBook Pro 13-inch built on logic board 820-2936, with K90i appearing in the name as the internal project code and a revision marking of A. At 1.74 MB it most likely holds a schematic and or boardview set for this board. Apple prints the 820-xxxx number on the logic board itself, so confirm it matches before tracing power rails, checking the PPBUS line or locating test points. Boardview files of this kind open in tools such as OpenBoardView or FlexBV, schematics in a PDF reader.
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 @hrtechno. 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.