diff -r 0acc5626a578 Lib/mimetypes.py
--- a/Lib/mimetypes.py	Tue Oct 23 22:50:11 2012 +0100
+++ b/Lib/mimetypes.py	Thu Oct 25 00:35:09 2012 +0300
@@ -378,12 +378,14 @@
         '.taz': '.tar.gz',
         '.tz': '.tar.gz',
         '.tbz2': '.tar.bz2',
+        '.txz': '.tar.xz',
         }
 
     encodings_map = {
         '.gz': 'gzip',
         '.Z': 'compress',
         '.bz2': 'bzip2',
+        '.xz': 'xz',
         }
 
     # Before adding new types, make sure they are either registered with IANA,