diff --git a/MatroskaLib/MatroskaLib/MkvFilesContainer.cs b/MatroskaLib/MatroskaLib/MkvFilesContainer.cs
index 9499db6..5cdbd2e 100644
--- a/MatroskaLib/MatroskaLib/MkvFilesContainer.cs
+++ b/MatroskaLib/MatroskaLib/MkvFilesContainer.cs
@@ -8,7 +8,7 @@ namespace MatroskaLib;
 public class MkvFilesContainer
 {
     public readonly List<MkvFile> MkvFiles = new();
-    public readonly List<MkvFile> MkFilesRejected = new();
+    public readonly List<(MkvFile file, string error)> MkFilesRejected = new();
 
     public MkvFilesContainer(string[] filePaths)
     {
@@ -16,10 +16,11 @@ public MkvFilesContainer(string[] filePaths)
         MkvFiles.Add(files[0]);
         for (int i = 1; i < files.Count; i++)
         {
-            if (files[0].CompareTo(files[i]) == 0)
+            string? error = files[0].CompareToGetError(files[i]);
+            if (error is null)
                 MkvFiles.Add(files[i]);
             else
-                MkFilesRejected.Add(files[i]);
+                MkFilesRejected.Add((files[i], error));
         }
     }
 
diff --git a/MatroskaLib/MatroskaLib/Types/MkvFile.cs b/MatroskaLib/MatroskaLib/Types/MkvFile.cs
index aa538ab..99e1ae6 100644
--- a/MatroskaLib/MatroskaLib/Types/MkvFile.cs
+++ b/MatroskaLib/MatroskaLib/Types/MkvFile.cs
@@ -6,7 +6,7 @@
 
 namespace MatroskaLib.Types;
 
-public record MkvFile : IComparable<MkvFile>
+public record MkvFile
 {
     public required string filePath { get; init; }
     public required List<Track> tracks { get; init; }
@@ -18,7 +18,7 @@ public record MkvFile : IComparable<MkvFile>
     public required int tracksPosition { get; init; }
     public required int beginHeaderPosition { get; init; }
 
-    public int CompareTo(MkvFile? other)
+    public string? CompareToGetError(MkvFile? other)
     {
         if (other is null)
             throw new ArgumentNullException(nameof(other));
@@ -27,11 +27,16 @@ public int CompareTo(MkvFile? other)
         {
             var track = tracks[i];
             var trackOther = other.tracks.ElementAtOrDefault(i);
-            if (trackOther is null || track.number != trackOther.number || track.language != trackOther.language)
-                return -1;
+            
+            if (trackOther is null)
+                return $"Track at index {i} does not exist, expected {track.type}{track.language}.";
+            if (track.number != trackOther.number)
+                return $"Track number {i} does not match. Expected {track.number}, got {trackOther.number}.";
+            if (track.language != trackOther.language)
+                return $"Track language {i} does not match. Expected {track.language}, got {trackOther.language}.";
         }
 
-        return 0;
+        return null;
     }
 
     public override string ToString() => 
diff --git a/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs b/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs
index 381c32f..600e904 100644
--- a/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs
+++ b/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs
@@ -58,12 +58,15 @@ private void LoadFiles()
         mkvContainer = new MkvFilesContainer(filePaths);
         if (mkvContainer.MkFilesRejected.Count > 0)
         {
+            var sourceFile = Path.GetFileName(filePaths[0]);
+            
             string rejectedFiles = Environment.NewLine + Environment.NewLine;
             mkvContainer.MkFilesRejected.ForEach((x) =>
             {
-                rejectedFiles += Path.GetFileName(x.filePath) + Environment.NewLine + Environment.NewLine;
+                rejectedFiles += $"- {Path.GetFileName(x.file.filePath)}: {x.error} {Environment.NewLine}{Environment.NewLine}";
             });
-            MessageBox.Show("The following files were rejected: " + rejectedFiles, MessageBoxType.Warning);
+            MessageBox.Show($"The following files have different tracks or the order is different than {sourceFile}: {rejectedFiles}These files cannot be processed.", 
+                MessageBoxType.Warning);
         }
 
         var lsSubtitleTracks = mkvContainer.GetSubtitleTracks();