RAR package of about 1018 KB for the Xiaomi Mi 4C smartphone. The name states the device but not what the archive holds, so check whether it is a schematic, boardview or other service data once unpacked. Such repair files help locate components, follow power and signal paths and identify test points when troubleshooting boot, charging or display faults. The Mi 4C uses a different board from the Mi 4 and Mi 4S, so compare the markings on the PCB with the material before trusting it.
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 @SMART_PHONE_SCHEMATICS. 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.