Archive for the Apple iPhone X, a 9.35 MB RAR with no further detail in its name about the enclosed files. Since the iPhone X uses a stacked two-layer logic board, reference material for it usually covers both the application processor side and the baseband side, so check which parts are included. Technicians use schematics and boardviews to trace power rails, locate components and find test points for diode-mode measurements. Open boardview data with a suitable viewer, and confirm the board numbers match the phone before working.
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 @schematic_mobiles. 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.