diff --git a/MainWindow.axaml.cs b/MainWindow.axaml.cs
index b01d20f..dc58973 100644
--- a/MainWindow.axaml.cs
+++ b/MainWindow.axaml.cs
@@ -991,6 +991,10 @@ public partial class MainWindow : Window
     private async void BtnWikiAddFile_OnClick(object? sender, RoutedEventArgs e)
     {
         var result = await NamingWindow.Show(this);
+        if (!result.EndsWith(".md")) result += ".md";
+        if (!Directory.Exists(Global._instance.wiki_storage_path))
+            Directory.CreateDirectory(Global._instance.wiki_storage_path);
+        
         if (result != null)
             try
             {