http://bugs.winehq.org/show_bug.cgi?id=18089
--- Comment #21 from Igor Tarasov tarasov.igor@gmail.com 2009-06-02 05:46:18 --- Regarding launching files without extension:
MSDN says: "The file name can be provided without its .exe extension. If necessary, the ShellExecute function adds the extension when searching App Paths" http://msdn.microsoft.com/en-us/library/cc144150(VS.85).aspx
But there is no such thing in shlexec.c. I suppose, that this option could be added somewhere at SHELL_TryAppPathW.