diff --git a/Tools/KTDReaderGUI/KTDReaderGUI/App.config b/Tools/KTDReaderGUI/KTDReaderGUI/App.config
index 193aecc67..422c29aad 100644
--- a/Tools/KTDReaderGUI/KTDReaderGUI/App.config
+++ b/Tools/KTDReaderGUI/KTDReaderGUI/App.config
@@ -3,4 +3,7 @@
     <startup> 
         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
     </startup>
+  <appSettings>
+    <add key="GkvKostentragerdateiFolderPath" value="C:\GkvAbrechnung\KTDatei\" />
+  </appSettings>
 </configuration>
\ No newline at end of file
diff --git a/Tools/KTDReaderGUI/KTDReaderGUI/KTDReaderGUI.csproj b/Tools/KTDReaderGUI/KTDReaderGUI/KTDReaderGUI.csproj
index 1cf96c8e8..64fc3168f 100644
--- a/Tools/KTDReaderGUI/KTDReaderGUI/KTDReaderGUI.csproj
+++ b/Tools/KTDReaderGUI/KTDReaderGUI/KTDReaderGUI.csproj
@@ -36,6 +36,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
+    <Reference Include="System.Configuration" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.CSharp" />
diff --git a/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml b/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml
index 3c4411fab..cc7dd4e2c 100644
--- a/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml
+++ b/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml
@@ -38,23 +38,35 @@
                 <RowDefinition Height="auto" />
                 <RowDefinition Height="auto" />
                 <RowDefinition Height="auto" />
+                <RowDefinition Height="auto" />
                 <RowDefinition Height="*" />
             </Grid.RowDefinitions>
 
-            <Label Grid.Row="0" Grid.Column="0">IK Krankenkasse</Label>
+            <Label
+                Grid.Row="0"
+                Grid.Column="0"
+                IsEnabled="False">
+                Kostenträger Path
+            </Label>
             <TextBox
-                x:Name="input_krankenkasse"
+                x:Name="input_file"
                 Grid.Row="0"
                 Grid.Column="2" />
 
-            <Label Grid.Row="1" Grid.Column="0">Leistungserbringergruppe</Label>
+            <Label Grid.Row="1" Grid.Column="0">IK Krankenkasse</Label>
             <TextBox
-                x:Name="input_leistungsgruppe"
+                x:Name="input_krankenkasse"
                 Grid.Row="1"
                 Grid.Column="2" />
 
-            <Button
+            <Label Grid.Row="2" Grid.Column="0">Leistungserbringergruppe</Label>
+            <TextBox
+                x:Name="input_leistungsgruppe"
                 Grid.Row="2"
+                Grid.Column="2" />
+
+            <Button
+                Grid.Row="3"
                 Grid.ColumnSpan="3"
                 Width="100"
                 HorizontalAlignment="Center"
@@ -62,34 +74,33 @@
                 Ermitteln
             </Button>
 
-            <Label Grid.Row="3" Grid.Column="0">IK Krankenkasse</Label>
+            <Label Grid.Row="4" Grid.Column="0">IK Krankenkasse</Label>
             <TextBox
                 x:Name="out_ikkrankenkasse"
-                Grid.Row="3"
-                Grid.Column="2"
-                IsEnabled="False" />
-
-            <Label Grid.Row="4" Grid.Column="0">IK Kostenträger</Label>
-            <TextBox
-                x:Name="out_ikkostentrager"
                 Grid.Row="4"
                 Grid.Column="2"
                 IsEnabled="False" />
 
-            <Label Grid.Row="5" Grid.Column="0">IK Datenannahmestelle</Label>
+            <Label Grid.Row="5" Grid.Column="0">IK Kostenträger</Label>
             <TextBox
-                x:Name="out_ikdatenannahmestelle"
+                x:Name="out_ikkostentrager"
                 Grid.Row="5"
                 Grid.Column="2"
                 IsEnabled="False" />
 
-            <Label Grid.Row="6" Grid.Column="0">Bez Datenannahmestelle</Label>
+            <Label Grid.Row="6" Grid.Column="0">IK Datenannahmestelle</Label>
             <TextBox
-                x:Name="out_bezdatenannahmestelle"
+                x:Name="out_ikdatenannahmestelle"
                 Grid.Row="6"
                 Grid.Column="2"
                 IsEnabled="False" />
 
+            <Label Grid.Row="7" Grid.Column="0">Bez Datenannahmestelle</Label>
+            <TextBox
+                x:Name="out_bezdatenannahmestelle"
+                Grid.Row="7"
+                Grid.Column="2"
+                IsEnabled="False" />
         </Grid>
     </Grid>
 </Window>
diff --git a/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml.cs b/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml.cs
index 751bf4c92..ee35d0378 100644
--- a/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml.cs
+++ b/Tools/KTDReaderGUI/KTDReaderGUI/MainWindow.xaml.cs
@@ -1,6 +1,7 @@
 using Dakota.Logic;
 using System;
 using System.Collections.Generic;
+using System.Configuration;
 using System.IO;
 using System.Linq;
 using System.Text;
@@ -22,20 +23,53 @@ namespace KTDReaderGUI
 	/// </summary>
 	public partial class MainWindow : Window
 	{
+		private string KostentragerdateiFolderPath { get; set; } = ConfigurationManager.AppSettings.Get("GkvKostentragerdateiFolderPath");
+
 		private DakotaKTDReader Reader;
 
 		public MainWindow()
 		{
 			InitializeComponent();
 
-			var root = Directory.GetCurrentDirectory();
+			try
+			{
+				load();
+			}
+			catch (Exception ex)
+			{
+				MessageBox.Show(ex.ToString());
+			}
+		}
 
-			var path = System.IO.Path.Combine(root, "KTDatei");
+		private void load()
+		{
+			var path = KostentragerdateiFolderPath;
+
+			if (string.IsNullOrEmpty(path))
+			{
+				var root = Directory.GetCurrentDirectory();
+
+				path = System.IO.Path.Combine(root, "KTDatei");
+			}
+
+			input_file.Text = path;
 
 			Reader = new DakotaKTDReader(path);
 		}
 
 		private void Button_Click(object sender, RoutedEventArgs e)
+		{
+			try
+			{
+				calc();
+			}
+			catch(Exception ex)
+			{
+				MessageBox.Show(ex.ToString());
+			}
+		}		
+
+		private void calc()
 		{
 			var ikkrankenkasse = input_krankenkasse.Text;
 			var leistungsgruppe = input_leistungsgruppe.Text;
@@ -45,10 +79,17 @@ namespace KTDReaderGUI
 
 			var rtn = Reader.Resolve(ikkrankenkasse, leistungsgruppe.Substring(0, 2), leistungsgruppe.Substring(2, 5));
 
-			out_ikkrankenkasse.Text = rtn.Item3;
-			out_ikkostentrager.Text = rtn.Item2;
-			out_ikdatenannahmestelle.Text = rtn.Item1;
-			out_bezdatenannahmestelle.Text = rtn.Item4;
+			if (rtn is null)
+			{
+				MessageBox.Show("Eingabe konnte nicht gefunden werden.");
+			}
+			else
+			{
+				out_ikkrankenkasse.Text = rtn.Item3;
+				out_ikkostentrager.Text = rtn.Item2;
+				out_ikdatenannahmestelle.Text = rtn.Item1;
+				out_bezdatenannahmestelle.Text = rtn.Item4;
+			}
 		}
 	}
 }