MobaXTerm tries to ShellExecute "/bin/sh" when running under wine. This ability to run unix executables on the host via unix paths was accidentally removed in the attemp to align ShellExecute more closely with native, while fixing the problem that sometimes wrong executable is started by ShellExecute (e.g. in Motor Race Collection).
Related: a2548c8db3096963012939c82e340f6b867f3efd Fixes: 85d029e3b01f6dd35a86cc07796af982d66e4a03
-- v4: shell32: Restore the ability of running unix executables via unix paths