diff --git a/Source/Directory.Build.props b/Source/Directory.Build.props
index c97a124..9aad919 100644
--- a/Source/Directory.Build.props
+++ b/Source/Directory.Build.props
@@ -16,8 +16,7 @@
   <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
     <!-- https://learn.microsoft.com/en-us/dotnet/core/project-sdk/msbuild-props#enforcecodestyleinbuild -->
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
-    <!-- TODO: enable this -->
-    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/Source/Launchbar.sln b/Source/Launchbar.sln
index 2f5b708..569730e 100644
--- a/Source/Launchbar.sln
+++ b/Source/Launchbar.sln
@@ -1,6 +1,6 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
+# 17
 VisualStudioVersion = 17.0.31903.59
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Launchbar", "Launchbar\Launchbar.csproj", "{55B26A32-A0F3-4E58-8B0F-D992D199069F}"
diff --git a/Source/Launchbar/App.xaml.cs b/Source/Launchbar/App.xaml.cs
index 82b5c49..03328ba 100644
--- a/Source/Launchbar/App.xaml.cs
+++ b/Source/Launchbar/App.xaml.cs
@@ -10,10 +10,7 @@
 
 namespace Launchbar;
 
-/// <summary>
-/// Interaction logic for App.xaml
-/// </summary>
-public sealed partial class App : Application
+public sealed partial class App : Application, IDisposable
 {
 #if DEBUG
     private const string MutexName = @"Global\LaunchbarSingleInstanceMutex(Debug)";
@@ -25,11 +22,7 @@ public sealed partial class App : Application
 
     private static SplashScreen? splashScreen;
 
-    // ReSharper disable NotAccessedField.Local
-#pragma warning disable IDE0052 // Remove unread private members - We need to keep the mutex alive during the lifetime of the app.
     private readonly Mutex instanceMutex;
-#pragma warning restore IDE0052 // Remove unread private members
-    // ReSharper restore NotAccessedField.Local
 
     private WindowBar? barLeft;
 
@@ -109,7 +102,7 @@ public App()
 
         setting.PropertyChanged += this.settingsPropertyChanged;
 
-        this.contextMenu = this.FindResource("contextMenuTemplate") as ContextMenu ?? throw new InvalidOperationException("Missing 'contextMenuTemplate'.");
+        this.contextMenu = this.FindResource("ContextMenuTemplate") as ContextMenu ?? throw new InvalidOperationException("Missing 'contextMenuTemplate'.");
         this.forceContextMenuLayout();
 
         try
@@ -286,4 +279,16 @@ public static ContextMenu RequestContextMenu()
         // Attach to this object.
         return app.contextMenu;
     }
+
+    protected override void OnExit(ExitEventArgs e)
+    {
+        base.OnExit(e);
+
+        this.instanceMutex.Dispose();
+    }
+
+    public void Dispose()
+    {
+        this.instanceMutex.Dispose();
+    }
 }
\ No newline at end of file
diff --git a/Source/Launchbar/Launchbar.csproj b/Source/Launchbar/Launchbar.csproj
index e5ea1ba..c4df4bd 100644
--- a/Source/Launchbar/Launchbar.csproj
+++ b/Source/Launchbar/Launchbar.csproj
@@ -6,13 +6,13 @@
     <TargetFramework>net8.0-windows</TargetFramework>
     <UseWPF>true</UseWPF>
     <OutputType>WinExe</OutputType>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 
     <ApplicationIcon>Resources\Next.ico</ApplicationIcon>
-    <Version>5.2.0-preview.1</Version>
+    <Version>5.2.0-preview.2</Version>
     <Authors>Launchbar</Authors>
     <Description>RunIT to the next level.</Description>
     <Copyright>Copyright © Mertsch $([System.DateTime]::UtcNow.Year)</Copyright>
-    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 
     <IsPublishable>true</IsPublishable>
     <!-- https://learn.microsoft.com/en-us/dotnet/core/project-sdk/msbuild-props#generateassemblyinfo -->
@@ -20,10 +20,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="fm.Extensions.Wpf" Version="5.0.0" />
-    <PackageReference Include="JetBrains.Annotations" Version="2024.2.0-eap1" />
+    <PackageReference Include="fm.Extensions.Wpf" Version="5.0.1" />
+    <PackageReference Include="JetBrains.Annotations" Version="2024.2.0" />
     <PackageReference Include="Markdig.Wpf" Version="0.5.0.1" />
-    <PackageReference Include="WpfScreenHelper" Version="2.1.0" />
+    <PackageReference Include="WpfScreenHelper" Version="2.1.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/Source/Launchbar/Menu.cs b/Source/Launchbar/Menu.cs
index 6435620..c0a65df 100644
--- a/Source/Launchbar/Menu.cs
+++ b/Source/Launchbar/Menu.cs
@@ -11,14 +11,14 @@ public sealed class Menu : NotifyBase
 {
     #region Fields
 
-    private MenuEntryCollection entries;
+    private MenuEntryCollection? entries;
 
     #endregion
 
     /// <summary>
     /// Gets or sets a list of menu entries.
     /// </summary>
-    public MenuEntryCollection Entries
+    public MenuEntryCollection? Entries
     {
         get { return this.entries; }
         set
diff --git a/Source/Launchbar/MenuEntryAdvanced.cs b/Source/Launchbar/MenuEntryAdvanced.cs
index 1135827..8c1f2ff 100644
--- a/Source/Launchbar/MenuEntryAdvanced.cs
+++ b/Source/Launchbar/MenuEntryAdvanced.cs
@@ -1,7 +1,6 @@
-using System.Text;
+using Launchbar.Win32;
 using System.Windows.Media;
 using System.Xml.Serialization;
-using Launchbar.Win32;
 
 namespace Launchbar;
 
@@ -150,7 +149,7 @@ public void UpdateIcon()
             {
                 if (p.IsValidFile) // Valid file?
                 {
-                    newIcon = WinHelper.ExtractAssociatedIcon(p.PathAbsolute);
+                    newIcon = WinHelper.ExtractAssociatedIcon(p.PathAbsolute!); // IsValidFile tests the path
                     newType = IconType.Custom;
                 }
                 else if (p.IsValidPath) // Valid dictionary?
@@ -181,18 +180,13 @@ public void ChooseIcon()
         {
             if (this is Program { IsValidFile: true } p) // When the program path is valid, use that path as default.
             {
-                path = p.Path;
+                path = p.Path!; // IsValidFile tests the path
             }
         }
 
-        // We need to have a string that is long enough to handle a more complex path than
-        // the default one (more characters in length).
-        StringBuilder sb = new StringBuilder(path, 4096); // 4095 + null-char should be enough
-
-        // Methods returns one when pressing OK in the dialog.
-        if (SafeNativeMethods.PickIconDlg(nint.Zero, sb, (uint)sb.Capacity, ref index) == 1)
+        if (WinHelper.PickIconDialog(ref path, ref index))
         {
-            this.IconPath = sb.ToString(); //save the information
+            this.IconPath = path;
             this.IconIndex = index;
         }
         this.UpdateIcon();
diff --git a/Source/Launchbar/Win32/SafeNativeMethods.cs b/Source/Launchbar/Win32/LibraryImport.cs
similarity index 95%
rename from Source/Launchbar/Win32/SafeNativeMethods.cs
rename to Source/Launchbar/Win32/LibraryImport.cs
index b751e5f..d65e55a 100644
--- a/Source/Launchbar/Win32/SafeNativeMethods.cs
+++ b/Source/Launchbar/Win32/LibraryImport.cs
@@ -1,6 +1,4 @@
 using System.Runtime.InteropServices;
-using System.Security;
-using System.Text;
 
 // ReSharper disable InconsistentNaming
 // ReSharper disable UnusedMember.Global
@@ -9,8 +7,7 @@
 
 namespace Launchbar.Win32;
 
-[SuppressUnmanagedCodeSecurity]
-internal static partial class SafeNativeMethods
+internal static partial class LibraryImport
 {
     internal const string User32 = @"user32.dll";
 
@@ -94,8 +91,8 @@ public static nint SetWindowLongPtr(nint hWnd, int nIndex, nint dwNewLong)
     /// <param name="piIconIndex">[in, out] A pointer to an integer that, on entry, specified the index of
     /// the initial selection. On exit, the integer specifies the index of the icon that was selected.</param>
     /// <returns>Returns 1 if successful; otherwise, 0.</returns>
-    [DllImport(Shell32, EntryPoint = "PickIconDlg", CharSet = CharSet.Unicode)]
-    public static extern int PickIconDlg(nint hwnd, StringBuilder pszIconPath, uint cchIconPath, ref int piIconIndex);
+    [LibraryImport(Shell32, EntryPoint = "PickIconDlg", StringMarshalling = StringMarshalling.Utf16)]
+    public static partial int PickIconDlg(nint hwnd, [In, Out] char[] pszIconPath, uint cchIconPath, ref int piIconIndex);
 
     /// <summary>
     /// Destroys an icon and frees any memory the icon occupied.
diff --git a/Source/Launchbar/Win32/WinHelper.cs b/Source/Launchbar/Win32/WinHelper.cs
index a411516..e57a6dd 100644
--- a/Source/Launchbar/Win32/WinHelper.cs
+++ b/Source/Launchbar/Win32/WinHelper.cs
@@ -20,11 +20,11 @@ internal static class WinHelper
     public static BitmapSource? ExtractAssociatedIcon(string path)
     {
         int i = 0;
-        nint hIcon = SafeNativeMethods.ExtractAssociatedIcon(nint.Zero, path, ref i);
+        nint hIcon = LibraryImport.ExtractAssociatedIcon(nint.Zero, path, ref i);
         if (hIcon != nint.Zero)
         {
             BitmapSource bms = Imaging.CreateBitmapSourceFromHIcon(hIcon, Int32Rect.Empty, null);
-            SafeNativeMethods.DestroyIcon(hIcon);
+            LibraryImport.DestroyIcon(hIcon);
             return bms;
         }
         return null;
@@ -39,11 +39,11 @@ internal static class WinHelper
     /// <returns>The extracted icon as <see cref="BitmapSource"/>.</returns>
     public static BitmapSource? ExtractIcon(string path, int index)
     {
-        nint hIcon = SafeNativeMethods.ExtractIcon(nint.Zero, path, (uint)index);
+        nint hIcon = LibraryImport.ExtractIcon(nint.Zero, path, (uint)index);
         if (hIcon != nint.Zero)
         {
             BitmapSource bms = Imaging.CreateBitmapSourceFromHIcon(hIcon, Int32Rect.Empty, null);
-            SafeNativeMethods.DestroyIcon(hIcon);
+            LibraryImport.DestroyIcon(hIcon);
             return bms;
         }
         return null;
@@ -55,21 +55,21 @@ internal static class WinHelper
     /// </summary>
     public static void SendMouseButtonDown(MouseButton button)
     {
-        SafeNativeMethods.MOUSEINPUT mi = new SafeNativeMethods.MOUSEINPUT
+        LibraryImport.MOUSEINPUT mi = new LibraryImport.MOUSEINPUT
             {
                 dwFlags = button switch
                     {
-                        MouseButton.Left => SafeNativeMethods.MOUSEINPUTFLAGS.MOUSEEVENTF_LEFTDOWN,
-                        MouseButton.Right => SafeNativeMethods.MOUSEINPUTFLAGS.MOUSEEVENTF_RIGHTDOWN,
+                        MouseButton.Left => LibraryImport.MOUSEINPUTFLAGS.MOUSEEVENTF_LEFTDOWN,
+                        MouseButton.Right => LibraryImport.MOUSEINPUTFLAGS.MOUSEEVENTF_RIGHTDOWN,
                         _ => throw new NotSupportedException(),
                     },
             };
 
-        SafeNativeMethods.MOUSEKEYBDHARDWAREINPUT mkhInput = new SafeNativeMethods.MOUSEKEYBDHARDWAREINPUT { mi = mi };
+        LibraryImport.MOUSEKEYBDHARDWAREINPUT mkhInput = new LibraryImport.MOUSEKEYBDHARDWAREINPUT { mi = mi };
 
-        SafeNativeMethods.INPUT input = new SafeNativeMethods.INPUT { type = SafeNativeMethods.INPUT_TYPE.MOUSE, mkhi = mkhInput };
+        LibraryImport.INPUT input = new LibraryImport.INPUT { type = LibraryImport.INPUT_TYPE.MOUSE, mkhi = mkhInput };
 
-        SafeNativeMethods.SendInput(1, ref input, Marshal.SizeOf(input));
+        LibraryImport.SendInput(1, ref input, Marshal.SizeOf(input));
     }
 
     /// <summary>
@@ -78,21 +78,21 @@ public static void SendMouseButtonDown(MouseButton button)
     /// </summary>
     public static void SendMouseButtonUp(MouseButton button)
     {
-        SafeNativeMethods.MOUSEINPUT mi = new SafeNativeMethods.MOUSEINPUT
+        LibraryImport.MOUSEINPUT mi = new LibraryImport.MOUSEINPUT
             {
                 dwFlags = button switch
                     {
-                        MouseButton.Left => SafeNativeMethods.MOUSEINPUTFLAGS.MOUSEEVENTF_LEFTUP,
-                        MouseButton.Right => SafeNativeMethods.MOUSEINPUTFLAGS.MOUSEEVENTF_RIGHTUP,
+                        MouseButton.Left => LibraryImport.MOUSEINPUTFLAGS.MOUSEEVENTF_LEFTUP,
+                        MouseButton.Right => LibraryImport.MOUSEINPUTFLAGS.MOUSEEVENTF_RIGHTUP,
                         _ => throw new NotSupportedException(),
                     },
             };
 
-        SafeNativeMethods.MOUSEKEYBDHARDWAREINPUT mkhInput = new SafeNativeMethods.MOUSEKEYBDHARDWAREINPUT { mi = mi };
+        LibraryImport.MOUSEKEYBDHARDWAREINPUT mkhInput = new LibraryImport.MOUSEKEYBDHARDWAREINPUT { mi = mi };
 
-        SafeNativeMethods.INPUT input = new SafeNativeMethods.INPUT { type = SafeNativeMethods.INPUT_TYPE.MOUSE, mkhi = mkhInput };
+        LibraryImport.INPUT input = new LibraryImport.INPUT { type = LibraryImport.INPUT_TYPE.MOUSE, mkhi = mkhInput };
 
-        SafeNativeMethods.SendInput(1, ref input, Marshal.SizeOf(input));
+        LibraryImport.SendInput(1, ref input, Marshal.SizeOf(input));
     }
 
     /// <summary>
@@ -101,35 +101,50 @@ public static void SendMouseButtonUp(MouseButton button)
     /// </summary>
     public static void SendMouseMoveRelative(int x, int y)
     {
-        SafeNativeMethods.MOUSEINPUT mi = new SafeNativeMethods.MOUSEINPUT
+        LibraryImport.MOUSEINPUT mi = new LibraryImport.MOUSEINPUT
             {
-                dwFlags = SafeNativeMethods.MOUSEINPUTFLAGS.MOUSEEVENTF_MOVE,
+                dwFlags = LibraryImport.MOUSEINPUTFLAGS.MOUSEEVENTF_MOVE,
                 dx = x,
                 dy = y,
             };
 
-        SafeNativeMethods.MOUSEKEYBDHARDWAREINPUT mkhInput = new SafeNativeMethods.MOUSEKEYBDHARDWAREINPUT
+        LibraryImport.MOUSEKEYBDHARDWAREINPUT mkhInput = new LibraryImport.MOUSEKEYBDHARDWAREINPUT
             {
                 mi = mi,
             };
 
-        SafeNativeMethods.INPUT input = new SafeNativeMethods.INPUT
+        LibraryImport.INPUT input = new LibraryImport.INPUT
             {
-                type = SafeNativeMethods.INPUT_TYPE.MOUSE,
+                type = LibraryImport.INPUT_TYPE.MOUSE,
                 mkhi = mkhInput,
             };
 
-        SafeNativeMethods.SendInput(1, ref input, Marshal.SizeOf(input));
+        LibraryImport.SendInput(1, ref input, Marshal.SizeOf(input));
     }
 
     public static void SetAsToolWindow(this Window window)
     {
         nint handle = new WindowInteropHelper(window).EnsureHandle();
-        nint oldFlags = SafeNativeMethods.GetWindowLongPtr(handle, GWL.GWL_EXSTYLE);
+        nint oldFlags = LibraryImport.GetWindowLongPtr(handle, GWL.GWL_EXSTYLE);
         if (oldFlags != nint.Zero)
         {
             nint newFlags = new nint(oldFlags.ToInt64() | ExtendedWindowStyles.WS_EX_TOOLWINDOW);
-            SafeNativeMethods.SetWindowLongPtr(handle, GWL.GWL_EXSTYLE, newFlags);
+            LibraryImport.SetWindowLongPtr(handle, GWL.GWL_EXSTYLE, newFlags);
         }
     }
+
+    public static bool PickIconDialog(ref string path, ref int index)
+    {
+        // We need to have a string that is long enough to handle a more complex path than the default one (more characters in length).
+        char[] pathBuffer = new char[32 * 1024]; // https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
+        path.CopyTo(pathBuffer);
+
+        // Method returns one when pressing OK in the dialog.
+        if (LibraryImport.PickIconDlg(nint.Zero, pathBuffer, (uint)pathBuffer.Length, ref index) == 1)
+        {
+            path = new string(pathBuffer, 0, Array.IndexOf(pathBuffer, '\0')); // Extract string from null terminated string.
+            return true;
+        }
+        return false;
+    }
 }
\ No newline at end of file
diff --git a/Source/Launchbar/WindowSettings.xaml.cs b/Source/Launchbar/WindowSettings.xaml.cs
index b36fcbd..107cf61 100644
--- a/Source/Launchbar/WindowSettings.xaml.cs
+++ b/Source/Launchbar/WindowSettings.xaml.cs
@@ -243,7 +243,7 @@ private void addMenuEntry(MenuEntry newEntry)
         }
         else
         {
-            Settings.Default.Menu.Entries.Add(newEntry);
+            Settings.Default.Menu.Entries?.Add(newEntry);
         }
     }