Waaaa, it's seems to resolve the sad regression:

• would you just remove the binaries ? (will do from my environment)
• I see it works on launcher_template_WINDOWS.cpp too ... Can you add it ? otherwise I'll do after

I reverted replacing the binaries.

For the window launcher, adding the same code technically forwards the command line arguments, but I'm getting different behavior between & '.\IDLE (Python GUI).exe' <path> from a command prompt, .\scripts\winidle.bat <path> from a command prompt and drag-and-drop onto the IDLE launcher, so

I submitted it as a separate PR (#1572). I think I fixed the previous issues.