diff --git a/ChatController/Resource.Designer.cs b/ChatController/Resource.Designer.cs
index 06739b1..157cd5d 100644
--- a/ChatController/Resource.Designer.cs
+++ b/ChatController/Resource.Designer.cs
@@ -107,7 +107,7 @@ namespace ChatController {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Office Dokumente und Bilder |*.doc;*.docx;*.xls;*.ppt;*.txt;*.pdf;*.jpg;*.png;*.jpeg;*.jpe;*.gif;*.bmp.
+        ///   Looks up a localized string similar to Office Dokumente und Bilder |*.doc;*.docx;*.xls;*.xlsx;*.ppt;*.pptx;*.txt;*.pdf;*.jpg;*.png;*.jpeg;*.jpe;*.gif;*.bmp.
         /// </summary>
         public static string OpenFileDialogFilter_Test {
             get {
diff --git a/ChatController/Resource.resx b/ChatController/Resource.resx
index 887d38f..3752683 100644
--- a/ChatController/Resource.resx
+++ b/ChatController/Resource.resx
@@ -161,6 +161,6 @@
     <value>ownChatNewMessageSync.txt</value>
   </data>
     <data name="OpenFileDialogFilter_Test" xml:space="preserve">
-        <value>Office Dokumente und Bilder |*.doc;*.docx;*.xls;*.ppt;*.txt;*.pdf;*.jpg;*.png;*.jpeg;*.jpe;*.gif;*.bmp</value>
+        <value>Office Dokumente und Bilder |*.doc;*.docx;*.xls;*.xlsx;*.ppt;*.pptx;*.txt;*.pdf;*.jpg;*.png;*.jpeg;*.jpe;*.gif;*.bmp</value>
     </data>
 </root>
\ No newline at end of file