Archive tied to a Sony Vaio laptop with a Quanta RJ6 mainboard, per the project code repeated in the name. No specific Vaio model or board revision is listed, so identification relies on the RJ6 marking printed on the PCB by Quanta. The 770 KB RAR likely contains a circuit diagram useful for following voltage rails, checking for shorts to ground and locating parts around the power-on circuitry. Extract it with any standard RAR tool and confirm that the revision on your board matches the document.
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 @generalschematics. 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.