I had already made the changes to cmd.bat and register_python.bat suggested by #316. However, I found "WinPython Control Panel.exe" icon crashed with WinPython 3.4.4.2 installed in
"C:\Program Files". Here is how I fixed it:

In env_for_icons.bat, change:
call %~dp0env.bat
to:
call "%~dp0env.bat"

In wpcp.bat, change:
%WINPYDIR%\python.exe
to:
"%WINPYDIR%\python.exe"

I suspect there are other calls or direct use of executables in the batch files in the WinPython scripts folder that need the same fix.