Archive labelled only for the HP HDX16 laptop, with no board number, ODM code or revision in the name, so its exact contents are unknown until extracted. At under 1 MB it most likely contains a schematic or a related service document. Before using it, identify the mainboard project code printed on the PCB and compare it with the title block inside the documents. Repair work with such files includes tracing supply rails, checking for shorts on main voltages and finding the components behind power and charging 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 @IT_SERVICE_WORLD. 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.