Zipped schematic package labelled G730-U00, a model or project code given without a brand, so identify the device from the board itself before use. The 602 KB archive most likely holds a PDF or similar circuit diagram set. Technicians use such drawings to follow power rails from the charger or PMIC, trace signal lines between chips and find the parts behind a no-power or no-boot fault. Extract it with any archive tool and check that the code and revision printed on the PCB match the document before trusting values or pinouts.
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 @esquematicosparatodos. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.