diff --git a/ArcFormats/Tanaka/ArcARC0.cs b/ArcFormats/Tanaka/ArcARC0.cs
index 82805506..53064147 100644
--- a/ArcFormats/Tanaka/ArcARC0.cs
+++ b/ArcFormats/Tanaka/ArcARC0.cs
@@ -40,6 +40,7 @@ namespace GameRes.Formats.Will
         public Arc0Opener ()
         {
             Extensions = new string[] { "arc" };
+            Signatures = new uint[] { 0x30435241, 0x30414654 };
         }
 
         public override ArcFile TryOpen (ArcView file)
diff --git a/ArcFormats/Tanaka/ArcWRC.cs b/ArcFormats/Tanaka/ArcWRC.cs
index d3026ba4..27b3af58 100644
--- a/ArcFormats/Tanaka/ArcWRC.cs
+++ b/ArcFormats/Tanaka/ArcWRC.cs
@@ -31,12 +31,17 @@ namespace GameRes.Formats.Will
     [Export(typeof(ArchiveFormat))]
     public class WrcOpener : ArchiveFormat
     {
-        public override string         Tag { get { return "WRC"; } }
+        public override string         Tag { get { return "WVX"; } }
         public override string Description { get { return "Tanaka Tatsuhiro's engine audio archive"; } }
         public override uint     Signature { get { return 0x30585657; } } // 'WVX0'
         public override bool  IsHierarchic { get { return false; } }
         public override bool      CanWrite { get { return false; } }
 
+        public WrcOpener ()
+        {
+            Extensions = new string[] { "wvx", "wrc" };
+        }
+
         public override ArcFile TryOpen (ArcView file)
         {
             uint total_size = file.View.ReadUInt32 (4);