Use guid instead of app name to create the mutex

ClipCMD/App.xaml.cs

@@ -1,4 +1,5 @@
-using System.Threading;
+using System;
+using System.Threading;
 using System.Windows;
 
 namespace ClipCMD;
@@ -8,20 +9,28 @@ namespace ClipCMD;
 /// </summary>
 public partial class App : Application
 {
-    Mutex mutex;
+    public const string AppName = "ClipCMD";
+
+    public const string AppGuid = "68d780d4-b946-4154-8815-e4632e5ec5d8";
+
+    private Mutex? mutex;
+
     protected override void OnStartup(StartupEventArgs e)
     {
-        const string appName = "ClipCMD";
+        mutex = new Mutex(true, AppGuid, out bool createdNew);
-
-        mutex = new Mutex(true, appName, out bool createdNew);
 
         if (!createdNew)
         {
             //App is already running! Exiting the application
-            _ = MessageBox.Show($"Another instance of {appName} already running!", $"{appName} is already running!", MessageBoxButton.OK, MessageBoxImage.Exclamation);
+            _ = MessageBox.Show($"Another instance of {AppName} already running!", $"{AppName} is already running!", MessageBoxButton.OK, MessageBoxImage.Exclamation);
             Current.Shutdown();
         }
 
-        base.OnStartup(e);
+        Exit += CloseHandler;
+    }
+
+    protected void CloseHandler(object sender, EventArgs e)
+    {
+        mutex?.ReleaseMutex();
     }
 }

ClipCMD/MainWindow.xaml.cs

@@ -8,6 +8,7 @@ using System.IO;
 using System.Linq;
 using System.Management.Automation;
 using System.Management.Automation.Language;
+using System.Reflection;
 using System.Text;
 using System.Text.Json;
 using System.Threading.Tasks;
@@ -45,7 +46,7 @@ public partial class MainWindow : Window
 
         notifyIcon.Click += NotifyIcon_Click;
 
-        string applicationDataPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+        string applicationDataPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "StoneRed");
         string folderPath = Path.Combine(applicationDataPath, "ClipCMD");
 
         if (!Directory.Exists(folderPath))
@@ -69,6 +70,12 @@ public partial class MainWindow : Window
         DataContext = this;
 
         InitializeComponent();
+
+#if DEBUG
+        Title = $"{App.AppName} - Dev {Assembly.GetExecutingAssembly().GetName().Version}";
+#else
+        Title = $"{App.AppName} - {Assembly.GetExecutingAssembly().GetName().Version}";
+#endif
     }
 
     protected override void OnSourceInitialized(EventArgs e)