Compressed RAR package of about 2.96 MB for the Huawei G730 smartphone; the name gives only the model, so the exact contents are not stated. Huawei repair bundles of this size typically carry a schematic or maintenance guide covering the power management section, charging path, display and RF blocks. A technician would use it to trace supply rails, find test points and narrow down a short circuit, but should first confirm the board version printed on the PCB matches the drawings.
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 @tamirat_moobile. 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.