diff --git a/ArcFormats/BellDa/ArcDAT.cs b/ArcFormats/BellDa/ArcDAT.cs
index 70bc0b5f..4034bb9d 100644
--- a/ArcFormats/BellDa/ArcDAT.cs
+++ b/ArcFormats/BellDa/ArcDAT.cs
@@ -68,6 +68,7 @@ namespace GameRes.Formats.BellDa
 
         public override IImageDecoder OpenImage (ArcFile arc, Entry entry)
         {
+            // XXX compression method identical to Maika.Mk2Opener
             var id_str = arc.File.View.ReadString (entry.Offset, 2);
             if (id_str != "B1" && id_str != "D1" && id_str != "E1")
                 return base.OpenImage (arc, entry);
diff --git a/ArcFormats/Maika/ArcMK2.cs b/ArcFormats/Maika/ArcMK2.cs
index ce19b44f..e18e3ce2 100644
--- a/ArcFormats/Maika/ArcMK2.cs
+++ b/ArcFormats/Maika/ArcMK2.cs
@@ -41,6 +41,11 @@ namespace GameRes.Formats.Maika
         public override bool  IsHierarchic { get { return false; } }
         public override bool      CanWrite { get { return false; } }
 
+        public Mk2Opener ()
+        {
+            Signatures = new uint[] { 0x2E324B4D, 0x2E324C42 }; // 'BL2.0'
+        }
+
         public override ArcFile TryOpen (ArcView file)
         {
             if (!file.View.AsciiEqual (4, "0\0"))