Archive for the Apple iPhone X, 6.44 MB in RAR format, without any indication of what it contains. It may hold a schematic, boardview or other repair data, so extract it and check the files. iPhone X uses a stacked two-layer logic board, and repair documents help locate rails, test points and components on each layer. Confirm the board variant matches before use, since models with different modems can differ in layout and 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.
7-ZipWinRARThe Unarchiver (macOS)