[pygtk] Error with a pygtk program on Windows

[nohics nohics]

Hello, I have a simple program that works on Linux but doesn't work on
Windows:

import gtk

class MyClass:
   def __init__ (self):
      builder = gtk.Builder()
      builder.add_from_file("interface.glade")
      self.window1 = builder.get_object("window1")
      builder.connect_signals(self)

   def on_window1_destroy(self, widget, data=None):
      gtk.main_quit()

if __name__ == "__main__":
   ok = MyClass()
   ok.window1.show()
   gtk.main()

I have this error:
Traceback (most recent call last):
  File "C:\prog.py", line 14, in <module>
    ok = MyClass()
  File "C:\prog.py", line 6, in __init__
    builder.add_from_file("interface.glade")
gobject.GError: Balise non g├®r├®e┬á: ┬½┬árequires┬á┬╗

Any idea ?
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