diff --git a/package/AgentWindowsManaged/Program.cs b/package/AgentWindowsManaged/Program.cs
index febd3f055..8b2c5e26d 100644
--- a/package/AgentWindowsManaged/Program.cs
+++ b/package/AgentWindowsManaged/Program.cs
@@ -13,9 +13,7 @@
 using System.IO.Compression;
 using System.Linq;
 using System.Security.Cryptography;
-using System.Text.RegularExpressions;
 using System.Windows.Forms;
-using System.Xml;
 
 using WixSharp;
 using WixSharp.CommonTasks;
@@ -427,33 +425,16 @@ private static void Project_UIInitialized(SetupEventArgs e)
         string lcid = CultureInfo.CurrentUICulture.TwoLetterISOLanguageName == "fr" ? frFR.Key : enUS.Key;
 
         using Stream stream = Assembly.GetExecutingAssembly()
-            .GetManifestResourceStream($"DevolutionsAgent.Resources.{Languages[lcid]}");
+            .GetManifestResourceStream($"DevolutionsAgent.Resources.{Languages[lcid]}")
+            ?? throw new FileNotFoundException($"Missing localization resource: {Languages[lcid]}");
+        using MemoryStream memory = new();
+        stream.CopyTo(memory);
 
-        XmlDocument xml = new();
-        xml.Load(stream);
+        InstallerRuntime runtime = e.ManagedUI.Shell.RuntimeContext as InstallerRuntime
+            ?? throw new InvalidOperationException("Managed UI runtime is not available");
+        runtime.UIText.InitFromWxl(memory.ToArray(), true);
 
-        Dictionary<string, string> strings = new();
-
-        foreach (XmlNode s in xml.GetElementsByTagName("String"))
-        {
-            strings.Add(s.Attributes["Id"].Value, s.InnerText);
-        }
-
-        string I18n(string key)
-        {
-            if (!strings.TryGetValue(key, out string result))
-            {
-                return key;
-            }
-
-            return Regex.Replace(result, @"\[(.*?)]", (match) =>
-            {
-                string property = match.Groups[1].Value;
-                string value = e.Session[property];
-
-                return string.IsNullOrEmpty(value) ? property : value;
-            });
-        }
+        string I18n(string key) => $"[{key}]".LocalizeWith(runtime.Localize);
 
         if (!Environment.Is64BitOperatingSystem)
         {