Index: Lib/lib-tk/FixTk.py
===================================================================
--- Lib/lib-tk/FixTk.py	(revision 73981)
+++ Lib/lib-tk/FixTk.py	(working copy)
@@ -42,6 +42,8 @@
         # Ignore leading \\?\
         if s.startswith(u"\\\\?\\"):
             s = s[4:]
+        if s.startswith(u"UNC"):
+            s = u"\\" + s[3:]
         return s
 
 prefix = os.path.join(sys.prefix,"tcl")