RAR archive of 2.96 MB labelled only G730, with no brand stated in the input. The name does not reveal what the archive holds, so it may contain schematics, solution diagrams or other repair material; extract it with WinRAR or 7-Zip to see the contents. Repair packs of this sort typically help a technician trace circuits, find jumper points and identify components on a phone board. Verify that the device and board inside the archive actually match the unit on your bench before relying on any diagram.
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 @schematic_mobiles. 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.