Hello!
Here and example that we can add manually a path on windows:
http://1.bp.blogspot.com/_NtoTtHZadHE/S0SLPiJo-2I/AAAAAAAAAIg/GyoW0pPEW-g/s400/qt-mobility-windows-env-path.png
I need to add new path on the system (or user (it does not matter) ) from my Java program (no problem if my java program must start with administrator privilages).
Thank you!