RAR package of 1.17 MB for the Honor 8 Lite, a phone in Huawei's Honor line. Nothing in the name states whether it holds schematics, a board layout or firmware, so treat it as unidentified service data until you unpack it. Material of this kind is normally used to find power supply lines, charging ICs, connector pinouts and measurement points during board-level repair. Compare the model code and PCB marking on your device before following any values or component 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 @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.