diff --git a/CSharp/Engines/WindowsForms/Libraries/UniversalEditor.UserInterface.WindowsForms/CommonDialog.cs b/CSharp/Engines/WindowsForms/Libraries/UniversalEditor.UserInterface.WindowsForms/CommonDialog.cs
index 457dda02..d23d4864 100644
--- a/CSharp/Engines/WindowsForms/Libraries/UniversalEditor.UserInterface.WindowsForms/CommonDialog.cs
+++ b/CSharp/Engines/WindowsForms/Libraries/UniversalEditor.UserInterface.WindowsForms/CommonDialog.cs
@@ -32,7 +32,8 @@ namespace UniversalEditor.UserInterface.WindowsForms
 			}
 			if (includeAllFiles)
 			{
-				sb.Append("|All files (*.*)|*.*");
+				if (sb.Length > 0) sb.Append("|");
+				sb.Append("All files (*.*)|*.*");
 			}
 			return sb.ToString();
 		}