RAR archive named QD-R62-MB-E, which follows Quanta project naming: project R62, mainboard, revision E. The name gives no laptop brand or document type, and at 2.64 MB it is probably a schematic PDF, so extract it and check the contents. Quanta boards print a matching DA0R62MB code on the PCB, and the revision letter should agree before relying on the diagram. A Quanta schematic is used to trace the charger circuit, system and CPU rails, EC signals and the power-on sequence when diagnosing no-power or no-display faults.
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 @cidschematicandboardviewofficial. 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.