Add project files.

Splitter/DropShadow.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Core
+{
+    public class DropShadow
+    {
+        #region Shadowing
+
+        #region Fields
+
+        private bool _isAeroEnabled = false;
+        private bool _isDraggingEnabled = false;
+        private const int WM_NCHITTEST = 0x84;
+        private const int WS_MINIMIZEBOX = 0x20000;
+        private const int HTCLIENT = 0x1;
+        private const int HTCAPTION = 0x2;
+        private const int CS_DBLCLKS = 0x8;
+        private const int CS_DROPSHADOW = 0x00020000;
+        private const int WM_NCPAINT = 0x0085;
+        private const int WM_ACTIVATEAPP = 0x001C;
+
+        #endregion
+
+        #region Structures
+
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public struct MARGINS
+        {
+            public int leftWidth;
+            public int rightWidth;
+            public int topHeight;
+            public int bottomHeight;
+        }
+
+        #endregion
+
+        #region Methods
+
+        #region Public
+
+        [DllImport("dwmapi.dll")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);
+
+        [DllImport("dwmapi.dll")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
+
+        [DllImport("dwmapi.dll")]
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static extern int DwmIsCompositionEnabled(ref int pfEnabled);
+
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public static bool IsCompositionEnabled()
+        {
+            if (Environment.OSVersion.Version.Major < 6) return false;
+
+            bool enabled;
+            DwmIsCompositionEnabled(out enabled);
+
+            return enabled;
+        }
+
+        #endregion
+
+        #region Private
+
+        [DllImport("dwmapi.dll")]
+        private static extern int DwmIsCompositionEnabled(out bool enabled);
+
+        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
+        private static extern IntPtr CreateRoundRectRgn
+        (
+            int nLeftRect,
+            int nTopRect,
+            int nRightRect,
+            int nBottomRect,
+            int nWidthEllipse,
+            int nHeightEllipse
+         );
+
+        private bool CheckIfAeroIsEnabled()
+        {
+            if (Environment.OSVersion.Version.Major >= 6)
+            {
+                int enabled = 0;
+                DwmIsCompositionEnabled(ref enabled);
+
+                return (enabled == 1) ? true : false;
+            }
+            return false;
+        }
+
+        #endregion
+
+        #region Overrides
+
+        public void ApplyShadows(Form form)
+        {
+            var v = 2;
+
+            DwmSetWindowAttribute(form.Handle, 2, ref v, 4);
+
+            MARGINS margins = new MARGINS()
+            {
+                bottomHeight = 1,
+                leftWidth = 0,
+                rightWidth = 0,
+                topHeight = 0
+            };
+
+            DwmExtendFrameIntoClientArea(form.Handle, ref margins);
+        }
+
+        #endregion
+
+        #endregion
+
+        #endregion
+    }
+}

Splitter/FormSplitter.cs

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+namespace Splitter
+{
+    public partial class FormSplitter : Form
+    {
+        public FormSplitter()
+        {
+            InitializeComponent();
+            (new Core.DropShadow()).ApplyShadows(this);
+        }
+
+        private void btnClose_Click(object sender, EventArgs e)
+        {
+            Application.Exit();
+        }
+    }
+}

Splitter/FormSplitter.resx

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+<root>
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

Splitter/Program.cs

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+namespace Splitter
+{
+    internal static class Program
+    {
+        /// <summary>
+        ///  The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main(string[] args)
+        {
+            // To customize application configuration such as set high DPI settings or default font,
+            // see https://aka.ms/applicationconfiguration.
+
+            if (args.Length > 0 && args[0] == "--gui")
+            {
+                ApplicationConfiguration.Initialize();
+                Application.Run(new FormSplitter());
+            }
+        }
+    }
+}

Splitter/Splitter.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <ApplicationIcon>icons\seperator.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Content Include="icons\seperator.ico" />
+  </ItemGroup>
+
+</Project>

TaskSplitter11.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33110.190
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TaskSplitter11", "TaskSplitter11\TaskSplitter11.csproj", "{1BB6B6E8-2B89-4C0C-B8FA-16096401B733}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Splitter", "Splitter\Splitter.csproj", "{D88803DC-E794-4653-B76F-A5A7C42235D5}"
+EndProject
+Project("{54435603-DBB4-11D2-8724-00A0C9A8B90C}") = "Installer", "Installer\Installer.vdproj", "{C1AB077D-77F6-4238-9413-A8C879F4D00D}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{CD6EEF27-01A7-4952-9181-CD24D8276686}"
+	ProjectSection(SolutionItems) = preProject
+		readme.md = readme.md
+		taskbar-split.png = taskbar-split.png
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1BB6B6E8-2B89-4C0C-B8FA-16096401B733}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1BB6B6E8-2B89-4C0C-B8FA-16096401B733}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1BB6B6E8-2B89-4C0C-B8FA-16096401B733}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1BB6B6E8-2B89-4C0C-B8FA-16096401B733}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D88803DC-E794-4653-B76F-A5A7C42235D5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D88803DC-E794-4653-B76F-A5A7C42235D5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D88803DC-E794-4653-B76F-A5A7C42235D5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D88803DC-E794-4653-B76F-A5A7C42235D5}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C1AB077D-77F6-4238-9413-A8C879F4D00D}.Debug|Any CPU.ActiveCfg = Debug
+		{C1AB077D-77F6-4238-9413-A8C879F4D00D}.Release|Any CPU.ActiveCfg = Release
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {07A71FEB-CE75-4CED-81D2-FB4E07A2D551}
+	EndGlobalSection
+EndGlobal