Repair package for the iPhone 5C, a 3.41 MB RAR archive whose exact files are not named. Bundles of this kind usually include the logic board schematic and a boardview layout, useful for tracing the battery, USB and display supply lines, locating test points and finding failed parts after liquid damage. Open boardview files with OpenBoardView or a similar viewer. Before trusting part locations, compare the board in hand with the documentation, since model variants can differ slightly.
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.