diff --git a/ArcFormats/Seraphim/ArcSeraph.cs b/ArcFormats/Seraphim/ArcSeraph.cs
index f9f765b0..7d2408b8 100644
--- a/ArcFormats/Seraphim/ArcSeraph.cs
+++ b/ArcFormats/Seraphim/ArcSeraph.cs
@@ -82,6 +82,7 @@ namespace GameRes.Formats.Seraphim
         public ArchPacOpener ()
         {
             Extensions = new string[] { "dat" };
+            ContainedFormats = new[] { "CB" };
         }
 
         public override ArcFile TryOpen (ArcView file)