diff --git a/CSharp/Libraries/UniversalEditor.UserInterface/IHostApplicationWindow.cs b/CSharp/Libraries/UniversalEditor.UserInterface/IHostApplicationWindow.cs
index d73f6daf..1d5e8386 100644
--- a/CSharp/Libraries/UniversalEditor.UserInterface/IHostApplicationWindow.cs
+++ b/CSharp/Libraries/UniversalEditor.UserInterface/IHostApplicationWindow.cs
@@ -21,7 +21,7 @@ namespace UniversalEditor.UserInterface
 		
 		void SaveProject();
 		void SaveProjectAs();
-		void SaveProjectAs(string FileName);
+		void SaveProjectAs(string FileName, DataFormat df);
 
 		void SaveAll();