Archive in RAR format, 62.2 KB, carrying the iPhone 5 boardview as a BVR file. After extraction it can be opened in boardview software compatible with BVR to inspect top and bottom component placement and net connections on the logic board. That makes it useful for locating filters, capacitors and connectors on dense phone boards, following the charging path, or checking which components share a shorted rail. Confirm that the iPhone 5 board on your bench matches before relying on its part positions.
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.