Store data in AppData

ClipCMD/App.xaml.cs

@@ -1,15 +1,26 @@
-using System;
-using System.Collections.Generic;
-using System.Configuration;
-using System.Data;
-using System.Linq;
-using System.Threading.Tasks;
+using System.Threading;
 using System.Windows;
 
 namespace ClipCMD;
+
 /// <summary>
 /// Interaction logic for App.xaml
 /// </summary>
 public partial class App : Application
 {
-}
+    protected override void OnStartup(StartupEventArgs e)
+    {
+        const string appName = "ClipCMD";
+
+        _ = new Mutex(true, appName, out bool createdNew);
+
+        if (!createdNew)
+        {
+            //App is already running! Exiting the application
+            _ = MessageBox.Show($"Another instance of {appName} already running!", $"{appName} is already running!", MessageBoxButton.OK, MessageBoxImage.Exclamation);
+            Current.Shutdown();
+        }
+
+        base.OnStartup(e);
+    }
+}

ClipCMD/MainWindow.xaml.cs

@@ -44,11 +44,16 @@ public partial class MainWindow : Window
 
         InitializeComponent();
 
-        string filePath = System.Reflection.Assembly.GetExecutingAssembly().Location;
-        string workPath = Path.GetDirectoryName(filePath) ?? "/";
+        string applicationDataPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+        string folderPath = Path.Combine(applicationDataPath, "ClipCMD");
 
-        cmdPath = Path.Combine(workPath, "cmd.txt");
-        fixPath = Path.Combine(workPath, "fix.txt");
+        if (!Directory.Exists(folderPath))
+        {
+            _ = Directory.CreateDirectory(folderPath);
+        }
+
+        cmdPath = Path.Combine(folderPath, "cmd.txt");
+        fixPath = Path.Combine(folderPath, "fix.txt");
     }
 
     protected override void OnSourceInitialized(EventArgs e)