diff --git a/Elwig/Services/DeliveryService.cs b/Elwig/Services/DeliveryService.cs
index 594dd59..4f3efca 100644
--- a/Elwig/Services/DeliveryService.cs
+++ b/Elwig/Services/DeliveryService.cs
@@ -566,7 +566,7 @@ namespace Elwig.Services {
                 }
             } else if (exportMode == ExportMode.Export) {
                 var d = new SaveFileDialog() {
-                    FileName = $"Lieferungen_{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.zip",
+                    FileName = $"Lieferungen_{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.elwig.zip",
                     DefaultExt = "zip",
                     Filter = "ZIP-Datei (*.zip)|*.zip",
                     Title = $"{DeliveryJournal.Name} speichern unter - Elwig"
@@ -589,7 +589,7 @@ namespace Elwig.Services {
             } else if (exportMode == ExportMode.Upload && App.Config.SyncUrl != null) {
                 Mouse.OverrideCursor = Cursors.AppStarting;
                 try {
-                    var filename = $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.zip";
+                    var filename = $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.elwig.zip";
                     var path = Path.Combine(App.TempPath, filename);
                     var list = await query
                         .Select(p => p.Delivery)
diff --git a/Elwig/Services/MemberService.cs b/Elwig/Services/MemberService.cs
index 6afc96e..e4f4847 100644
--- a/Elwig/Services/MemberService.cs
+++ b/Elwig/Services/MemberService.cs
@@ -412,7 +412,7 @@ namespace Elwig.Services {
                 }
             } else if (exportMode == ExportMode.Export) {
                 var d = new SaveFileDialog() {
-                    FileName = $"Mitglieder_{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.zip",
+                    FileName = $"Mitglieder_{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.elwig.zip",
                     DefaultExt = "zip",
                     Filter = "ZIP-Datei (*.zip)|*.zip",
                     Title = $"{MemberList.Name} speichern unter - Elwig"
@@ -435,7 +435,7 @@ namespace Elwig.Services {
             } else if (exportMode == ExportMode.Upload && App.Config.SyncUrl != null) {
                 Mouse.OverrideCursor = Cursors.AppStarting;
                 try {
-                    var filename = $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.zip";
+                    var filename = $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.elwig.zip";
                     var path = Path.Combine(App.TempPath, filename);
                     var list = await query
                         .OrderBy(m => m.MgNr)
diff --git a/Elwig/Windows/MainWindow.xaml.cs b/Elwig/Windows/MainWindow.xaml.cs
index d7247d5..ef02626 100644
--- a/Elwig/Windows/MainWindow.xaml.cs
+++ b/Elwig/Windows/MainWindow.xaml.cs
@@ -99,8 +99,8 @@ namespace Elwig.Windows {
             try {
                 var d = new OpenFileDialog() {
                     Title = "Export-Datei auswählen - Elwig",
-                    DefaultExt = ".zip",
-                    Filter = "ZIP-Datei (*.zip)|*.zip",
+                    DefaultExt = ".elwig.zip",
+                    Filter = "Elwig-Export-Datei (*.elwig.zip)|*.elwig.zip",
                     Multiselect = true,
                 };
                 if (d.ShowDialog() == true) {
@@ -158,7 +158,7 @@ namespace Elwig.Windows {
                 return;
             Mouse.OverrideCursor = Cursors.AppStarting;
             try {
-                var path = Path.Combine(App.TempPath, $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.zip");
+                var path = Path.Combine(App.TempPath, $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss}_{App.ZwstId}.elwig.zip");
                 using var ctx = new AppDbContext();
                 var deliveries = await ctx.Deliveries
                     .Where(d => d.Year == Utils.CurrentLastSeason && d.ZwstId == App.ZwstId)