Sony VAIO package for motherboard MBX-126, produced by Quanta under project code JE5, delivered as a 1.02 MB RAR archive. No model or revision is given in the name. Archives like this usually contain the Quanta schematic, useful for tracing rails from DC-in through the charger to the CPU and chipset supplies and for locating parts around a short. Extract it with WinRAR or 7-Zip. Both the Sony MBX number and the Quanta JE5 code are normally printed on the PCB, so match them and the revision before relying on the drawings.
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.