https://bugs.winehq.org/show_bug.cgi?id=54141
--- Comment #16 from Eric Pouech eric.pouech@gmail.com --- the commits fda954dfd4f1a0d07ca151324b9eaedc1f09964d and fda954dfd4f1a0d07ca151324b9eaedc1f09964d should prevent ctrl-\ to terminate the process in unix shell and processed mode
but I don't think we'll implement vim behavior for letting the user believe that ctrl-4 is actually defined on its own.