Add the -X parameters to the command line for X11 forwarding:
%PROGRAMFILES%\PuTTY\putty.exe -X
%PROGRAMFILES%\PuTTY\putty.exe -X -C
%PROGRAMFILES%\PuTTY\putty.exe -A
On startup, WinSCP is looking:
To be able to relocate your INI file, you have:
"C:\Program Files (x86)\WinSCP\WinSCP.exe" /ini=D:\myBackupDir\WinScp\WinSCP.ini