diff --git a/SabreTools.Serialization/Extensions/StringBuilderExtensions.cs b/SabreTools.Serialization/Extensions/StringBuilderExtensions.cs
index a29f7833..9f339e68 100644
--- a/SabreTools.Serialization/Extensions/StringBuilderExtensions.cs
+++ b/SabreTools.Serialization/Extensions/StringBuilderExtensions.cs
@@ -455,6 +455,24 @@ namespace SabreTools.Data.Extensions
             return sb.AppendLine($"{prefixString}: {valueString}");
         }
 
+        /// <summary>
+        /// Append a line containing a String[] value to a StringBuilder
+        /// </summary>
+        public static StringBuilder AppendLine(this StringBuilder sb, string?[]? value, string prefixString)
+        {
+            string valueString = "[NULL]";
+            if (value is not null)
+            {
+                var valueArr = Array.ConvertAll(value, s => s is null ? "[NULL]" : s);
+                valueString = string.Join(", ", valueArr);
+            }
+
+            if (valueString.Length == 0)
+                return sb.AppendLine($"{prefixString}: [EMPTY]");
+
+            return sb.AppendLine($"{prefixString}: {valueString}");
+        }
+
         /// <summary>
         /// Append a line containing a UInt64[] value to a StringBuilder
         /// </summary>
diff --git a/SabreTools.Serialization/Models/XboxExecutable/Certificate.cs b/SabreTools.Serialization/Models/XboxExecutable/Certificate.cs
index e27cb131..fbfa7d78 100644
--- a/SabreTools.Serialization/Models/XboxExecutable/Certificate.cs
+++ b/SabreTools.Serialization/Models/XboxExecutable/Certificate.cs
@@ -35,7 +35,7 @@ namespace SabreTools.Data.Models.XboxExecutable
         /// to matter with unsigned code (or signed code, for that matter), so they can all
         /// be set to zero.
         /// </summary>
-        public uint[] AlternativeTitleIDs { get; set; } = new uint[16];
+        public byte[][] AlternativeTitleIDs { get; set; } = new byte[16][];
 
         /// <summary>
         /// Allowed media types for this .XBE.
diff --git a/SabreTools.Serialization/Readers/XboxExecutable.cs b/SabreTools.Serialization/Readers/XboxExecutable.cs
index 24f0a471..a27b40fe 100644
--- a/SabreTools.Serialization/Readers/XboxExecutable.cs
+++ b/SabreTools.Serialization/Readers/XboxExecutable.cs
@@ -156,10 +156,10 @@ namespace SabreTools.Serialization.Readers
             obj.TitleID = data.ReadBytes(4);
             obj.TitleName = data.ReadBytes(0x50);
 
-            obj.AlternativeTitleIDs = new uint[16];
+            obj.AlternativeTitleIDs = new byte[16][];
             for (int i = 0; i < obj.AlternativeTitleIDs.Length; i++)
             {
-                obj.AlternativeTitleIDs[i] = data.ReadUInt32LittleEndian();
+                obj.AlternativeTitleIDs[i] = data.ReadBytes(4);
             }
 
             obj.AllowedMediaTypes = (AllowedMediaTypes)data.ReadUInt32LittleEndian();
diff --git a/SabreTools.Serialization/Wrappers/XboxExecutable.Printing.cs b/SabreTools.Serialization/Wrappers/XboxExecutable.Printing.cs
index 1a8a5ed4..8fe3c454 100644
--- a/SabreTools.Serialization/Wrappers/XboxExecutable.Printing.cs
+++ b/SabreTools.Serialization/Wrappers/XboxExecutable.Printing.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Text;
 using SabreTools.Data.Extensions;
 using SabreTools.Data.Models.XboxExecutable;
@@ -45,6 +46,7 @@ namespace SabreTools.Serialization.Wrappers
             builder.AppendLine(certificate.TitleName, "  Title name");
             builder.AppendLine(Encoding.Unicode.GetString(certificate.TitleName).TrimEnd('\0'), "  Title name (Unicode)");
             builder.AppendLine(certificate.AlternativeTitleIDs, "  Alternative title IDs");
+            builder.AppendLine(Array.ConvertAll(certificate.AlternativeTitleIDs, b => b.ToFormattedXBETitleID()), "  Alternative title IDs (Formatted)");
             builder.AppendLine($"  Allowed media types: {certificate.AllowedMediaTypes} (0x{certificate.AllowedMediaTypes:X})");
             builder.AppendLine($"  Game region: {certificate.GameRegion} (0x{certificate.GameRegion:X})");
             builder.AppendLine(certificate.GameRatings, "  Game ratings");
diff --git a/SabreTools.Serialization/Wrappers/XboxExecutable.cs b/SabreTools.Serialization/Wrappers/XboxExecutable.cs
index 425c96e7..729d67fd 100644
--- a/SabreTools.Serialization/Wrappers/XboxExecutable.cs
+++ b/SabreTools.Serialization/Wrappers/XboxExecutable.cs
@@ -1,3 +1,4 @@
+using System;
 using System.IO;
 using System.Text;
 using SabreTools.Data.Extensions;
@@ -16,6 +17,22 @@ namespace SabreTools.Serialization.Wrappers
 
         #region Extension Properties
 
+        /// <inheritdoc cref="Certificate.AlternativeTitleIDs"/>
+        public byte[][]? AlternativeTitleIDsBytes => Certificate?.AlternativeTitleIDs;
+
+        /// <inheritdoc cref="Certificate.AlternativeTitleIDs"/>
+        public string[]? AlternativeTitleIDsStrings
+        {
+            get
+            {
+                // Ignore invalid alternative title IDs
+                if (AlternativeTitleIDsBytes is null)
+                    return null;
+
+                return Array.ConvertAll(AlternativeTitleIDsBytes, ba => ba.ToFormattedXBETitleID() ?? "[NULL]");
+            }
+        }
+
         /// <inheritdoc cref="Header.BaseAddress"/>
         public uint BaseAddress => Model.Header?.BaseAddress ?? 0;