Could not open files in .idlerc directory if latter was hidden on Windows.

Issue 1743, Issue 1862.
Backport r60225, r60745

Lib/idlelib/NEWS.txt

@@ -3,6 +3,9 @@ What's New in IDLE 1.2.2c1?
 
 *Release date: XX-FEB-2008*
 
+- Could not open files in .idlerc directory if latter was hidden on Windows.  
+  Issue 1743, Issue 1862. (backport r60225, r60745)
+
 - format_paragraph_event wasn't returning a 'break' (backport r59453)
 
 - Corrected some bugs in AutoComplete.  Also, Page Up/Down in ACW implemented;                                                                               

Lib/idlelib/configHandler.py

@@ -142,7 +142,12 @@ class IdleUserConfParser(IdleConfParser):
 
         """
         if not self.IsEmpty():
-            cfgFile=open(self.file,'w')
+            fname = self.file
+            try:
+                cfgFile = open(fname, 'w')
+            except IOError:
+                os.unlink(fname)
+                cfgFile = open(fname, 'w')
             self.write(cfgFile)
         else:
             self.RemoveFile()