Hey, Dear. I used py2exe to build .exe application for the program. When I ran the .exe , there is ImportError: No module named System. In python script , I used Python for .NET package. " from System import * from System import String " It's working properly, if running directly from the script (python2.7+win7). But it failed if running .exe created by py2exe. Could anyone help? Appreciate it very much. Sam