rainmeter-studio/RainmeterStudio/App.xaml.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;
using RainmeterStudio.Business;
using RainmeterStudio.Documents.Text;

namespace RainmeterStudio
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        private void Application_Startup(object sender, StartupEventArgs e)
        {
            DocumentManager.Instance.RegisterEditorFactory(new TextEditorFactory());
        }
    }
}