tcl question

[MDK]

In PythonWin I entered this script from a book:

from Tkinter import Label
widget = Label(None, text='Hello GUI world!')
widget.pack()
widget.mainloop()

When I run it in PythonWin it runs fine.

When I double click on it in Windows explorer I get a message that tcl80.dll
can not be found.  That file does not exist on my PC.  How then is it
running under PythonWin if that file does not exists and how can I make it
run when double-clicked?

My path includes:

PATH=C:\Python22\;c:\python22\dlls\;C:\Python22\Lib;C:\Python22\Lib\lib-tk

Thanks.