Boardview for the Apple iPad 3, delivered as a 1.67 MB RAR archive; the name gives no logic board number or revision. Extract it and open the board file in a viewer that supports Apple layouts, such as FlexBV, ZXW-style tools or OpenBoardView, depending on the internal format. The layout shows where each component sits on the densely packed board, which is useful for tracing a net to a test point, finding a shorted capacitor on a power line, or locating charging and backlight parts. Make sure your logic board matches before trusting it.
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 @BoardSchematic. 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.