diff -r c30a3a6f3b39 Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py	Thu Jan 30 16:05:28 2014 -0800
+++ b/Lib/idlelib/PyShell.py	Thu Jan 30 23:10:44 2014 -0500
@@ -16,7 +16,7 @@
 
 import linecache
 from code import InteractiveInterpreter
-from platform import python_version
+from platform import python_version, system
 
 try:
     from tkinter import *
@@ -1529,6 +1529,10 @@
     enable_shell = enable_shell or not enable_edit
     # start editor and/or shell windows:
     root = Tk(className="Idle")
+    # set application icon
+    if system() == 'Windows':
+        iconfile = os.path.join(os.path.dirname(__file__), 'Icons', 'idle.ico')
+        root.wm_iconbitmap(default=iconfile)
 
     fixwordbreaks(root)
     root.withdraw()