Hi, Is very strange. I'm using Microsoft C++.net 2003 to compile my app. Now I have tried this: I created a new WIN32 console app with the wizard with this very simple code: Code: #include "stdafx.h" #include <windows.h> #include <process.h> int _tmain(int argc, _TCHAR* argv[]) { printf("%s", "\nHola\n"); execl("/bin/sh", "sh", "ls", NULL); return 0; } Neither works. Thanks for your contributions.