diff --git a/OpenKh.Tools.Kh2SystemEditor/ViewModels/SystemEditorViewModel.cs b/OpenKh.Tools.Kh2SystemEditor/ViewModels/SystemEditorViewModel.cs
index d01c0d02d..4d32b06ed 100644
--- a/OpenKh.Tools.Kh2SystemEditor/ViewModels/SystemEditorViewModel.cs
+++ b/OpenKh.Tools.Kh2SystemEditor/ViewModels/SystemEditorViewModel.cs
@@ -25,7 +25,7 @@ public class SystemEditorViewModel : BaseNotifyPropertyChanged
         private static readonly List<FileDialogFilter> IdxFilter = FileDialogFilterComposer.Compose()
             .AddExtensions("KH2.IDX", "idx").AddAllFiles();
         private static readonly List<FileDialogFilter> MsgFilter = FileDialogFilterComposer.Compose()
-            .AddExtensions("sys.msg", "msg", "bin").AddAllFiles();
+            .AddExtensions("sys.bar", "bar", "msg", "bin").AddAllFiles();
 
         private Window Window => Application.Current.Windows.OfType<Window>().FirstOrDefault(x => x.IsActive);
         private string _fileName;
@@ -177,6 +177,14 @@ private void OpenIdx(string fileName) => File.OpenRead(fileName).Using(stream =>
 
             var imgFileName = $"{Path.GetFileNameWithoutExtension(fileName)}.img";
             var imgFilePath = Path.Combine(Path.GetDirectoryName(fileName), imgFileName);
+
+            if (!File.Exists(imgFilePath))
+            {
+                MessageBox.Show($"Unable to find {imgFileName} in the same directory of the IDX loaded.",
+                    "Error", MessageBoxButton.OK, MessageBoxImage.Error);
+                return;
+            }
+
             File.OpenRead(imgFilePath).Using(imgStream =>
             {
                 var img = new Img(imgStream, Idx.Read(stream), false);