diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 307be2a7..86d58d8e 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -146,6 +146,8 @@
     <Compile Include="Marble\VideoANIM.cs" />
     <Compile Include="MD5.cs" />
     <Compile Include="Nekopunch\ArcPAK.cs" />
+    <Compile Include="NekoSDK\ArcDAT.cs" />
+    <Compile Include="NekoSDK\ImageALP.cs" />
     <Compile Include="NitroPlus\ArcPAK.cs" />
     <Compile Include="MnoViolet\ImageDIF.cs" />
     <Compile Include="Nexas\ImageGRP.cs" />
diff --git a/ArcFormats/NekoSDK/ArcDAT.cs b/ArcFormats/NekoSDK/ArcDAT.cs
new file mode 100644
index 00000000..0f223f8b
--- /dev/null
+++ b/ArcFormats/NekoSDK/ArcDAT.cs
@@ -0,0 +1,95 @@
+//! \file       ArcDAT.cs
+//! \date       Tue Aug 02 12:02:04 2016
+//! \brief      NekoSDK 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;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using GameRes.Compression;
+using GameRes.Utility;
+
+namespace GameRes.Formats.NekoSDK
+{
+    [Export(typeof(ArchiveFormat))]
+    public class DatOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "DAT/NekoSDK"; } }
+        public override string Description { get { return "NekoSDK engine resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        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 first_offset = file.View.ReadUInt32 (0x88) ^ 0xCACACAu;
+            if (first_offset <= 0 || first_offset >= file.MaxOffset)
+                return null;
+            int count = (int)first_offset / 0x8C;
+            if (first_offset != count * 0x8C)
+                return null;
+            if (!IsSaneCount (--count))
+                return null;
+
+            uint index_offset = 0;
+            var dir = new List<Entry> (count);
+            var name_buffer = new byte[0x80];
+            for (int i = 0; i < count; ++i)
+            {
+                file.View.Read (index_offset, name_buffer, 0, 0x80);
+                if (0 == name_buffer[0])
+                    return null;
+                var name = Binary.GetCString (name_buffer, 0, name_buffer.Length);
+                var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                entry.UnpackedSize  = file.View.ReadUInt32 (index_offset+0x80) ^ 0xCACACAu;
+                entry.Size          = file.View.ReadUInt32 (index_offset+0x84) ^ 0xCACACAu;
+                entry.Offset        = file.View.ReadUInt32 (index_offset+0x88) ^ 0xCACACAu;
+                if (entry.Offset < first_offset || !entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                entry.IsPacked = entry.UnpackedSize != 0;
+                if (!entry.IsPacked)
+                    entry.UnpackedSize = entry.Size;
+                index_offset += 0x8C;
+                dir.Add(entry);
+            }
+            if (0 == dir.Count)
+                return null;
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked)
+                return input;
+            return new LzssStream (input);
+        }
+    }
+}
diff --git a/ArcFormats/NekoSDK/ImageALP.cs b/ArcFormats/NekoSDK/ImageALP.cs
new file mode 100644
index 00000000..ce323688
--- /dev/null
+++ b/ArcFormats/NekoSDK/ImageALP.cs
@@ -0,0 +1,69 @@
+//! \file       ImageALP.cs
+//! \date       Tue Aug 02 15:35:56 2016
+//! \brief      NekoSDK BMP alpha-channel extension.
+//
+// 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;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+
+namespace GameRes.Formats.NekoSDK
+{
+    [Export(typeof(IBmpExtension))]
+    public class AlpBitmap : IBmpExtension
+    {
+        public ImageData Read (Stream file, BmpMetaData info)
+        {
+            if (info.BPP != 24 && info.BPP != 32 || !file.CanSeek)
+                return null;
+            var alp_name = Path.ChangeExtension (info.FileName, "alp");
+            if (alp_name.Equals (info.FileName, StringComparison.InvariantCultureIgnoreCase)
+                || !VFS.FileExists (alp_name))
+                return null;
+            var alpha_size = info.Width * info.Height;
+            var alpha = new byte[alpha_size];
+            using (var alp = VFS.OpenStream (alp_name))
+            {
+                if (alpha.Length != alp.Read (alpha, 0, alpha.Length) || alp.ReadByte() != -1)
+                    return null;
+            }
+            file.Position = info.HeaderLength;
+            int dst_stride = (int)info.Width * 4;
+            var pixels = new byte[(int)info.Height * dst_stride];
+            int src_pixel_size = info.BPP / 8;
+            int dst = (int)(info.Height-1) * dst_stride;
+            for (int y = (int)info.Height-1; y >= 0; --y)
+            {
+                int a_src = (int)info.Width * y;
+                for (int x = 0; x < dst_stride; x += 4)
+                {
+                    file.Read (pixels, dst+x, src_pixel_size);
+                    pixels[dst+x+3] = alpha[a_src++];
+                }
+                dst -= dst_stride;
+            }
+            return ImageData.Create (info, PixelFormats.Bgra32, null, pixels, dst_stride);
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index 3d2913cb..3fa1103a 100644
--- a/supported.html
+++ b/supported.html
@@ -284,7 +284,10 @@ Soukan Yuugi 2<br/>
 </td></tr>
 <tr class="odd"><td>*.bmd</td><td><tt>_BMD</tt></td><td>Yes</td></tr>
 <tr class="odd"><td>*.asd</td><td>-</td><td>No</td></tr>
-<tr><td>*.dat</td><td>-</td><td>Yes</td><td>Studio e.go!</td><td>Men at Work 2</td></tr>
+<tr><td>*.dat</td><td>-</td><td>Yes</td><td>Studio e.go!</td><td>
+Men at Work 2<br/>
+Natsu Kagura<br/>
+</td></tr>
 <tr class="odd"><td>*.mbl</td><td>-</td><td>No</td><td rowspan="3">Marble</td><td rowspan="3">
 Assault Angel Canon<br/>
 Chikatetsu Fuusa Jiken<br/>
@@ -388,6 +391,7 @@ Zansho Omimai Moushiagemasu<span class="footnote">ShiinaRio v2.41</span><br/>
 <tr><td>*.pad</td><td><tt>PAD</tt></td><td>No</td></tr>
 <tr class="odd"><td>*</td><td><tt>ARC2</tt><br/><tt>ARC1</tt></td><td>No</td><td>AST</td><td>
 Bokura wa Piacere<br/>
+Hokenshitsu no Sensei ~Onedari Bakunyuu Lesson~<br/>
 Jokyoushi wo Kurau<br/>
 Lovers Collection<br/>
 Nachtmusik<br/>
@@ -770,6 +774,8 @@ Izumo<br/>
 Izumo 2<br/>
 Izumo 2 ~Gakuen Kyousoukyoku~<br/>
 Izumo 3<br/>
+Oni Kagura<br/>
+Tsuki Kagura<br/>
 </td></tr>
 <tr class="odd"><td>*.pbx</td><td><tt>Pandora.box</tt></td><td>No</td><td>Terios</td><td>
 Ikinari Happy Bell<br/>
@@ -908,6 +914,7 @@ Sweet ~Hanjuku na Tenshi-tachi~<br/>
 Gakuen Taima! Holy x Moly<br/>
 Joi-san no Iitsuke!!<br/>
 Shiawase na Ohime-sama<br/>
+Shin Genre Esudere!!<br/>
 </td></tr>
 <tr class="odd"><td>*.nwa</td><td>-</td><td>No</td></tr>
 <tr class="odd"><td>*.g00</td><td>-</td><td>No</td></tr>
@@ -965,6 +972,8 @@ Cartagra<br/>
 Kara no Shoujo 2<br/>
 </td></td>
 <tr><td>data.NN<br/>ArcNN.dat</td><td>-</td><td>No</td><td>Cyberworks</td><td>
+Aniyome Kyouka-san to Sono Haha Chikako-san<br/>
+Aru Kazoku no Kankeizu<br/>
 Cosplay Ecchi ~Layer Kana no Yuuutsu~<br/>
 Hanamaru! 2<br/>
 Hime Kami 1/2<br/>
@@ -995,6 +1004,9 @@ Soushinjutsu Plus<br/>
 <tr><td>*.ns2</td><td>-</td><td>No</td><td>NScripter</td><td>
 Rakuin Hime Runed Princess<br/>
 </td></tr>
+<tr class="odd"><td>*.dat</td><td>-</td><td>No</td><td>NekoSDK</td><td>
+Elevator Panic ~Misshitsu no Inkou~<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>