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1. Hook UserPreferenceChanged
2. Set the Form font again when this event is raised
3. Unhook from UserPreferenceChanged in forms Dispose

NOTE: Make sure you unhook the UserPreferenceChanged in Dispose - otherwise you will cause a GC leak due to the reference to SystemEvents.

using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.Win32;
namespace WindowsApplication1 {
    public class Form1 : Form {
        public Form1() {
            this.Font = SystemFonts.IconTitleFont;
            InitializeComponent();
            SystemEvents.UserPreferenceChanged += new UserPreferenceChangedEventHandler(SystemEvents_UserPreferenceChanged);
        }

        void SystemEvents_UserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e) {
            if (e.Category == UserPreferenceCategory.Window) {
                this.Font = SystemFonts.IconTitleFont;
            }
        }

        protected override void Dispose(bool disposing) {
            if (disposing) {
                SystemEvents.UserPreferenceChanged -= new UserPreferenceChangedEventHandler(SystemEvents_UserPreferenceChanged);
                if (components != null) {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }

        private void InitializeComponent() {
            this.AutoScaleMode = AutoScaleMode.Font;
            this.AutoScaleDimensions = new System.Drawing.SizeF(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Name = "Form1";
            this.Text = "Form1";
        }

    }
}