Archive of repair documents for the Apple iPhone 5, 4.54 MB in RAR format, with contents not specified in the name. Expect schematic or boardview files for the logic board, which technicians use to map power rails, find the connectors and filters around a fault, and locate components when checking for a short. A boardview viewer such as FlexBV or OpenBoardView opens the layout, and PDFs cover the circuit diagram. Make sure the files match the exact board variant you are servicing.
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 @schematicslaptop. 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.