diff --git a/bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/File_viewFieldLibrary/my_thumbnail.xml b/bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/File_viewFieldLibrary/my_thumbnail.xml
index c9883e5be4f8117fa56680719a07bc88fe8e0605..e05fda9cee89959c949826b6a2b4f163109d7fa6 100644
--- a/bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/File_viewFieldLibrary/my_thumbnail.xml
+++ b/bt5/erp5_base/SkinTemplateItem/portal_skins/erp5_base/File_viewFieldLibrary/my_thumbnail.xml
@@ -262,7 +262,7 @@
                 </item>
                 <item>
                     <key> <string>image_format</string> </key>
-                    <value> <string>jpg</string> </value>
+                    <value> <string>png</string> </value>
                 </item>
                 <item>
                     <key> <string>image_resolution</string> </key>
diff --git a/bt5/erp5_base/bt/revision b/bt5/erp5_base/bt/revision
index 7b89b2202c953386efdf6390320429ff42de30a2..009bd2c17f2ddaf16118b7026a6a0697abb66f71 100644
--- a/bt5/erp5_base/bt/revision
+++ b/bt5/erp5_base/bt/revision
@@ -1 +1 @@
-406
\ No newline at end of file
+407
\ No newline at end of file