diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 6a74580f..0f1a1d43 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -398,6 +398,7 @@
     <Compile Include="Xuse\ArcWAG.cs" />
     <Compile Include="Xuse\ArcXARC.cs" />
     <Compile Include="Xuse\ArcXuse.cs" />
+    <Compile Include="Yox\ArcYOX.cs" />
     <Compile Include="Yuka\ArcYKC.cs" />
     <Compile Include="BlackCyc\AudioVAW.cs" />
     <Compile Include="WildBug\AudioWPN.cs" />
diff --git a/ArcFormats/Yox/ArcYOX.cs b/ArcFormats/Yox/ArcYOX.cs
new file mode 100644
index 00000000..97d50ca2
--- /dev/null
+++ b/ArcFormats/Yox/ArcYOX.cs
@@ -0,0 +1,120 @@
+//! \file       ArcYOX.cs
+//! \date       Wed Aug 17 10:54:39 2016
+//! \brief      Yox ADV+++ resource archives.
+//
+// Copyright (C) 2016 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.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Linq;
+using GameRes.Compression;
+
+namespace GameRes.Formats.Yox
+{
+    [Export(typeof(ArchiveFormat))]
+    public class DatOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "DAT/YOX"; } }
+        public override string Description { get { return "YOX ADV+++ engine resource archive"; } }
+        public override uint     Signature { get { return 0x584F59; } } // 'YOX'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public DatOpener ()
+        {
+            Extensions = new string[] { "dat" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            uint index_offset = file.View.ReadUInt32 (8);
+            int count = file.View.ReadInt32 (0xC);
+            if (!IsSaneCount (count) || index_offset >= file.MaxOffset)
+                return null;
+
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                var entry = new PackedEntry { Name = i.ToString ("D5") };
+                entry.Offset = file.View.ReadUInt32 (index_offset);
+                entry.Size   = file.View.ReadUInt32 (index_offset+4);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                index_offset += 8;
+            }
+            using (var stream = file.CreateStream())
+                DetectFileTypes (stream, dir);
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var input = base.OpenEntry (arc, entry);
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked)
+                return input;
+            return new ZLibStream (input, CompressionMode.Decompress);
+        }
+
+        void DetectFileTypes (Stream file, IList<Entry> dir)
+        {
+            foreach (PackedEntry entry in dir)
+            {
+                file.Position = entry.Offset;
+                uint signature = ReadUInt32 (file);
+                IResource res = null;
+                if (0x584F59 == signature) // 'YOX'
+                {
+                    if (0 != (2 & ReadUInt32 (file)))
+                    {
+                        entry.IsPacked = true;
+                        entry.UnpackedSize = ReadUInt32 (file);
+                        entry.Offset += 0x10;
+                        entry.Size   -= 0x10;
+                        file.Position = entry.Offset;
+                        using (var input = new ZLibStream (file, CompressionMode.Decompress, true))
+                            signature = ReadUInt32 (input);
+                        res = AutoEntry.DetectFileType (signature);
+                    }
+                }
+                else
+                    res = AutoEntry.DetectFileType (signature);
+                if (res != null)
+                {
+                    entry.Name = Path.ChangeExtension (entry.Name, res.Extensions.FirstOrDefault());
+                    entry.Type = res.Type;
+                }
+            }
+        }
+
+        static uint ReadUInt32 (Stream input)
+        {
+            uint v = (uint)input.ReadByte();
+            v |= (uint)input.ReadByte() << 8;
+            v |= (uint)input.ReadByte() << 16;
+            v |= (uint)input.ReadByte() << 24;
+            return v;
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index cefb2ee1..91b39d69 100644
--- a/supported.html
+++ b/supported.html
@@ -1049,6 +1049,9 @@ Binkan Ecchi! ~Futari no Oyatsu wa Tokunou Milk~<br/>
 Boku no Te no Naka no Rakuen<br/>
 </td></tr>
 <tr><td>*.fcb</td><td><tt>fcb1</tt></td><td>No</td></tr>
+<tr class="odd"><td>*.dat</td><td><tt>YOX</tt></td><td>No</td><td>Shelf</td><td>
+Kagiroi ~Shaku Kei~<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>