diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 13d6e05b..3c6d7b8f 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -96,6 +96,7 @@
     <Compile Include="BlackRainbow\ArcSPPAK.cs" />
     <Compile Include="Cadath\ArcDAF.cs" />
     <Compile Include="Cadath\ImageCGF.cs" />
+    <Compile Include="Cyberworks\ArcApp.cs" />
     <Compile Include="Foster\ArcC24.cs" />
     <Compile Include="Foster\ArcFA2.cs" />
     <Compile Include="Foster\ImageC24.cs" />
diff --git a/ArcFormats/Cyberworks/ArcAPP.cs b/ArcFormats/Cyberworks/ArcAPP.cs
new file mode 100644
index 00000000..ac6eb8cc
--- /dev/null
+++ b/ArcFormats/Cyberworks/ArcAPP.cs
@@ -0,0 +1,102 @@
+//! \file       ArcAPP.cs
+//! \date       Sun Mar 26 00:57:57 2017
+//! \brief      WendyBell resource archive.
+//
+// Copyright (C) 2017 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.Cyberworks
+{
+    [Export(typeof(ArchiveFormat))]
+    public class AppOpener : DatOpener
+    {
+        public override string         Tag { get { return "APP/Csystem"; } }
+        public override string Description { get { return "WendyBell resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public AppOpener ()
+        {
+            Extensions = new string[] { "appendix" };
+            Signatures = new uint[] { 0x2Fu };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            long index_offset = 4 + (long)file.View.ReadInt32 (0) * 2;
+            if (index_offset <= 4 || index_offset >= file.MaxOffset)
+                return null;
+            using (var toc_unpacker = new TocUnpacker (file))
+            {
+                var toc = toc_unpacker.Unpack (index_offset, 8);
+                if (null == toc)
+                    return null;
+                var data_offset = index_offset + 0x10 + toc_unpacker.PackedSize;
+                using (var index = new AppendixReader (toc, file, data_offset))
+                {
+                    if (!index.Read())
+                        return null;
+                    return new BellArchive (file, this, index.Dir, null);
+                }
+            }
+        }
+    }
+
+    internal class AppendixReader : IndexReader
+    {
+        long    m_data_offset;
+
+        public AppendixReader (byte[] toc, ArcView file, long data_offset) : base (toc, file)
+        {
+            m_data_offset = data_offset;
+        }
+
+        char[]  m_type = new char[2];
+
+        protected override bool ReadEntryType (Entry entry, int entry_size)
+        {
+            entry.Offset += m_data_offset;
+            m_type[0] = (char)m_index.ReadByte();
+            m_type[1] = (char)m_index.ReadByte();
+            if (m_type[0] > 0x20 && m_type[0] < 0x7F)
+            {
+                string ext;
+                if (m_type[1] > 0x20 && m_type[1] < 0x7F)
+                    ext = new string (m_type);
+                else
+                    ext = new string (m_type[0], 1);
+                if ("b0" == ext || "n0" == ext || "o0" == ext || "0b" == ext || "w0" == ext)
+                {
+                    entry.Type = "image";
+                    HasImages = true;
+                }
+                else if ("j0" == ext || "k0" == ext || "u0" == ext)
+                    entry.Type = "audio";
+                entry.Name = Path.ChangeExtension (entry.Name, ext);
+            }
+            return true;
+        }
+    }
+}