Index: Misc/NEWS
===================================================================
--- Misc/NEWS	(révision 81870)
+++ Misc/NEWS	(copie de travail)
@@ -412,6 +412,8 @@
 Library
 -------
 
+- Issue #8784: Default encoding of tarfile module is now 'utf-8' on Windows
+
 - Issue #8897: Fix sunau module, use bytes to write the header. Patch written
   by Thomas Jollans.
 
Index: Doc/library/tarfile.rst
===================================================================
--- Doc/library/tarfile.rst	(révision 81870)
+++ Doc/library/tarfile.rst	(copie de travail)
@@ -185,8 +185,8 @@
 
 .. data:: ENCODING
 
-   The default character encoding i.e. the value from either
-   :func:`sys.getfilesystemencoding` or :func:`sys.getdefaultencoding`.
+   The default character encoding: ``'utf-8'`` on Windows,
+   :func:`sys.getfilesystemencoding` otherwise.
 
 
 .. seealso::
Index: Lib/tarfile.py
===================================================================
--- Lib/tarfile.py	(révision 81870)
+++ Lib/tarfile.py	(copie de travail)
@@ -159,9 +159,10 @@
 #---------------------------------------------------------
 # initialization
 #---------------------------------------------------------
-ENCODING = sys.getfilesystemencoding()
-if ENCODING is None:
-    ENCODING = "ascii"
+if os.name not in ("nt", "ce"):
+    ENCODING = sys.getfilesystemencoding()
+else:
+    ENCODING = "utf-8"
 
 #---------------------------------------------------------
 # Some useful functions