WinSCP + Notepad++

Hi everyone!

I have a lot of portable apps on my usb drive and i'm taking it everywhere, but the only thing that goes wrong is that the drive letter may be different from time to time, so i can't launch program Notepad++ from WinSCP. I have solve the same problem in FreeCommander by using variable %FcSrcDrive%, is there any way like this one how to fix it in WinSCP?