diff --git a/templates/base.html b/templates/base.html
index 71bca98a44..067590feea 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -143,7 +143,7 @@
             </div>
             <div class="other-info fright">
                 <p>{% trans "Server Version: " %}{{ seafile_version }}</p>
-                <p>© 2012 {% trans "Seafile" %}</p>
+                <p>© 2013 {% trans "Seafile" %}</p>
                 <p><a href="http://seafile.com/{% if LANGUAGE_CODE == 'en' %}en/{% endif %}contact/" target="_blank">{% trans "Contact Us" %}</a></p>
             </div>
         </div>
diff --git a/utils/__init__.py b/utils/__init__.py
index ae8f7b947c..54a32cc1e6 100644
--- a/utils/__init__.py
+++ b/utils/__init__.py
@@ -264,7 +264,7 @@ def valid_previewed_file(filename):
     Check whether file can preview on web
     
     """
-    fileExt = os.path.splitext(filename)[1][1:]
+    fileExt = os.path.splitext(filename)[1][1:].lower()
     filetype = FILEEXT_TYPE_MAP.get(fileExt)
     if filetype:
         # Check whether this kind of file can be previewd.