diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml.cs b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
index bf7e5ba..faa9e9d 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml.cs
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml.cs
@@ -128,8 +128,9 @@ namespace Elwig.Windows {
             if (sender is not MenuItem m) return;
             var year = int.Parse(m.Header.ToString()?.Split(" ")[^1] ?? Utils.CurrentLastSeason.ToString());
             var d = new SaveFileDialog() {
-                FileName = $"{App.Client.NameToken}-Traubentransportscheinliste-{year}",
+                FileName = $"{App.Client.NameToken}-Traubentransportscheinliste-{year}.{Bki.FileExtension}",
                 DefaultExt = Bki.FileExtension,
+                Filter = "CSV-Datei (*.csv)|*.csv",
                 Title = $"Traubentransportscheinliste (BKI) speichern unter - Elwig"
             };
             if (d.ShowDialog() == true) {