diff --git a/Quick Link/CustomApplicationContext.cs b/Quick Link/CustomApplicationContext.cs
index 4205e61..852aabf 100644
--- a/Quick Link/CustomApplicationContext.cs	
+++ b/Quick Link/CustomApplicationContext.cs	
@@ -1,10 +1,12 @@
 using QuickLink.Properties;
 using System;
 using System.Diagnostics;
+using System.Runtime.Versioning;
 using System.Windows.Forms;
 
 namespace QuickLink
 {
+    [SupportedOSPlatform("windows")]
     class CustomApplicationContext : ApplicationContext
     {
         private NotifyIcon trayIcon;
@@ -27,11 +29,10 @@ public CustomApplicationContext()
                     }
                 },
                 Visible = true,
-
             };
             trayIcon.MouseClick += new MouseEventHandler(OnLeftClick);
 
-            hotkey.KeyPressed += new EventHandler<KeyPressedEventArgs>((object sender, KeyPressedEventArgs e) => ShowQuickInputForm());
+            hotkey.KeyPressed += (sender, e) => ShowQuickInputForm();
             hotkey.RegisterHotKey(ModifierKeys.Control | ModifierKeys.Win, Keys.R);
         }
 
diff --git a/Quick Link/GlobalKeyboardHotkey.cs b/Quick Link/GlobalKeyboardHotkey.cs
index 300f314..a35d51c 100644
--- a/Quick Link/GlobalKeyboardHotkey.cs	
+++ b/Quick Link/GlobalKeyboardHotkey.cs	
@@ -1,9 +1,11 @@
 using System;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using System.Windows.Forms;
 
 namespace QuickLink
 {
+    [SupportedOSPlatform("windows")]
     public sealed class GlobalKeyboardHotkey : IDisposable
     {
         // Registers a hot key with Windows.
@@ -65,7 +67,7 @@ public void Dispose()
         public GlobalKeyboardHotkey()
         {
             // register the event of the inner native window.
-            _window.KeyPressed += delegate (object sender, KeyPressedEventArgs args)
+            _window.KeyPressed += (sender, args) =>
             {
                 if (KeyPressed != null)
                     KeyPressed(this, args);
diff --git a/Quick Link/Program.cs b/Quick Link/Program.cs
index e952868..8129f27 100644
--- a/Quick Link/Program.cs	
+++ b/Quick Link/Program.cs	
@@ -6,7 +6,8 @@ namespace QuickLink
 {
     internal static class Program
     {
-        static Mutex mutex = new Mutex(true, "{6d5a148c-92e2-42ee-bf0e-f8cc887619fd}");
+        private static readonly Mutex mutex = new Mutex(true, "{6d5a148c-92e2-42ee-bf0e-f8cc887619fd}");
+
         [STAThread]
         static void Main()
         {
@@ -22,7 +23,6 @@ static void Main()
             {
                 MessageBox.Show("Quick Link is already running.");
             }
-
         }
     }
 }
diff --git a/Quick Link/Properties/AssemblyInfo.cs b/Quick Link/Properties/AssemblyInfo.cs
index 658f1c3..07df3f1 100644
--- a/Quick Link/Properties/AssemblyInfo.cs	
+++ b/Quick Link/Properties/AssemblyInfo.cs	
@@ -1,6 +1,7 @@
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 
 // Allgemeine Informationen über eine Assembly werden über die folgenden
 // Attribute gesteuert. Ändern Sie diese Attributwerte, um die Informationen zu ändern,
@@ -10,10 +11,13 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("Benjamin Knoop")]
 [assembly: AssemblyProduct("Quick Link")]
-[assembly: AssemblyCopyright("Copyright © 2024, 2025")]
+[assembly: AssemblyCopyright("Copyright © 2024-2026, Benjamin Knoop")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
+// Diese Assembly ist Windows-spezifisch; reduziert CA1416-Warnungen für Windows-APIs.
+[assembly: SupportedOSPlatform("windows")]
+
 // Durch Festlegen von ComVisible auf FALSE werden die Typen in dieser Assembly
 // für COM-Komponenten unsichtbar.  Wenn Sie auf einen Typ in dieser Assembly von
 // COM aus zugreifen müssen, sollten Sie das ComVisible-Attribut für diesen Typ auf "True" festlegen.
diff --git a/Quick Link/Quick Link.csproj b/Quick Link/Quick Link.csproj
index 45af866..0eacd55 100644
--- a/Quick Link/Quick Link.csproj	
+++ b/Quick Link/Quick Link.csproj	
@@ -1,110 +1,28 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{EF4B0D54-A24D-4E76-AB9D-40DB857AC8DE}</ProjectGuid>
     <OutputType>WinExe</OutputType>
+    <TargetFramework>net10.0-windows</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
     <RootNamespace>QuickLink</RootNamespace>
     <AssemblyName>QuickLink</AssemblyName>
-    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
-    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
-    <Deterministic>true</Deterministic>
-    <PublishUrl>publish\</PublishUrl>
-    <Install>true</Install>
-    <InstallFrom>Disk</InstallFrom>
-    <UpdateEnabled>false</UpdateEnabled>
-    <UpdateMode>Foreground</UpdateMode>
-    <UpdateInterval>7</UpdateInterval>
-    <UpdateIntervalUnits>Days</UpdateIntervalUnits>
-    <UpdatePeriodically>false</UpdatePeriodically>
-    <UpdateRequired>false</UpdateRequired>
-    <MapFileExtensions>true</MapFileExtensions>
-    <ApplicationRevision>0</ApplicationRevision>
-    <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
-    <IsWebBootstrapper>false</IsWebBootstrapper>
-    <UseApplicationTrust>false</UseApplicationTrust>
-    <BootstrapperEnabled>true</BootstrapperEnabled>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <PlatformTarget>x64</PlatformTarget>
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <PlatformTarget>x64</PlatformTarget>
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <PropertyGroup>
     <StartupObject>QuickLink.Program</StartupObject>
-  </PropertyGroup>
-  <PropertyGroup>
     <ApplicationIcon>SpiraPlan-FavIcon.ico</ApplicationIcon>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <!-- Use SDK default items for compile and embedded resources -->
+    <EnableDefaultCompileItems>true</EnableDefaultCompileItems>
+    <EnableDefaultEmbeddedResourceItems>true</EnableDefaultEmbeddedResourceItems>
+    <!-- Keep custom AssemblyInfo and don't auto-generate assembly attributes -->
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>
+
+  <!-- Let SDK implicitly include all .cs files and embedded resources in the project directory -->
   <ItemGroup>
-    <Reference Include="System" />
-    <Reference Include="System.Core" />
-    <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Deployment" />
-    <Reference Include="System.Drawing" />
-    <Reference Include="System.Net.Http" />
-    <Reference Include="System.Windows.Forms" />
-    <Reference Include="System.Xml" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="CustomApplicationContext.cs" />
-    <Compile Include="GlobalKeyboardHotkey.cs" />
-    <Compile Include="QuickInputForm.cs">
-      <SubType>Form</SubType>
-    </Compile>
-    <Compile Include="QuickInputForm.Designer.cs">
-      <DependentUpon>QuickInputForm.cs</DependentUpon>
-    </Compile>
-    <Compile Include="Program.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-    <EmbeddedResource Include="Properties\Resources.resx">
-      <Generator>ResXFileCodeGenerator</Generator>
-      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
-      <SubType>Designer</SubType>
-    </EmbeddedResource>
-    <Compile Include="Properties\Resources.Designer.cs">
-      <AutoGen>True</AutoGen>
-      <DependentUpon>Resources.resx</DependentUpon>
-      <DesignTime>True</DesignTime>
-    </Compile>
-    <EmbeddedResource Include="QuickInputForm.resx">
-      <DependentUpon>QuickInputForm.cs</DependentUpon>
-    </EmbeddedResource>
-    <None Include="Properties\Settings.settings">
-      <Generator>SettingsSingleFileGenerator</Generator>
-      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
-    </None>
-    <Compile Include="Properties\Settings.Designer.cs">
-      <AutoGen>True</AutoGen>
-      <DependentUpon>Settings.settings</DependentUpon>
-      <DesignTimeSharedInput>True</DesignTimeSharedInput>
-    </Compile>
-  </ItemGroup>
-  <ItemGroup>
+    <None Include="Properties\Settings.settings" Generator="SettingsSingleFileGenerator" LastGenOutput="Settings.Designer.cs" />
     <None Include="App.config" />
   </ItemGroup>
+
   <ItemGroup>
     <None Include="artifact-Requirement.png" />
     <None Include="artifact-Incident.png" />
@@ -112,17 +30,5 @@
     <None Include="artifact-TestCase.png" />
     <Content Include="SpiraPlan-FavIcon.ico" />
   </ItemGroup>
-  <ItemGroup>
-    <BootstrapperPackage Include=".NETFramework,Version=v4.7.2">
-      <Visible>False</Visible>
-      <ProductName>Microsoft .NET Framework 4.7.2 %28x86 und x64%29</ProductName>
-      <Install>true</Install>
-    </BootstrapperPackage>
-    <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
-      <Visible>False</Visible>
-      <ProductName>.NET Framework 3.5 SP1</ProductName>
-      <Install>false</Install>
-    </BootstrapperPackage>
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+
 </Project>
\ No newline at end of file
diff --git a/Quick Link/QuickInputForm.cs b/Quick Link/QuickInputForm.cs
index bfca62c..b718d52 100644
--- a/Quick Link/QuickInputForm.cs	
+++ b/Quick Link/QuickInputForm.cs	
@@ -2,10 +2,12 @@
 using System.Windows.Forms;
 using System.Diagnostics;
 using System.Text.RegularExpressions;
+using System.Runtime.Versioning;
 using QuickLink.Properties;
 
 namespace QuickLink
 {
+    [SupportedOSPlatform("windows")]
     public partial class QuickInputForm : Form
     {
         private const int CP_NOCLOSE_BUTTON = 0x200;
@@ -16,11 +18,11 @@ private enum TicketType { REQUIREMENT, INCIDENT, TESTCASE };
         public QuickInputForm()
         {
             InitializeComponent();
-            this.Deactivate += new System.EventHandler((object sender, EventArgs e) => Hide());
-            this.KeyDown += new KeyEventHandler(OnEnterPressed);
+            TopMost = true;
+            Deactivate += (sender, e) => Hide();
+            KeyDown += new KeyEventHandler(OnEnterPressed);
             TextBox.KeyDown += new KeyEventHandler(OnEnterPressed);
             TextBox.Select();
-            this.TopMost = true;
         }
 
         public void ShowAndInitialize()
@@ -168,8 +170,30 @@ private void OpenTicket(string validatedTicketString)
             }
             string url = CreateSpiraUrl(ticketType, "1011", number);
             Console.WriteLine("Opening {0}", url);
-            Process.Start(url);
+            OpenUrl(url);
         }
 
+        private void OpenUrl(string url)
+        {
+            if (!Uri.IsWellFormedUriString(url, UriKind.Absolute))
+            {
+                Console.WriteLine("Invalid URL: " + url);
+                return;
+            }
+
+            try
+            {
+                var psi = new ProcessStartInfo
+                {
+                    FileName = url,
+                    UseShellExecute = true
+                };
+                Process.Start(psi);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine("Error opening URL: " + ex.Message);
+            }
+        }
     }
 }