diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 035a837a..7841ea8a 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -301,6 +301,7 @@
     <Compile Include="TamaSoft\AudioESD.cs" />
     <Compile Include="TamaSoft\ImageBTN.cs" />
     <Compile Include="TamaSoft\ImageSUR.cs" />
+    <Compile Include="Taskforce\ArcDAT.cs" />
     <Compile Include="TechnoBrain\ImageIPH.cs" />
     <Compile Include="DxLib\ArcDX.cs" />
     <Compile Include="ArcMiris.cs" />
diff --git a/ArcFormats/Taskforce/ArcDAT.cs b/ArcFormats/Taskforce/ArcDAT.cs
new file mode 100644
index 00000000..b26a52c3
--- /dev/null
+++ b/ArcFormats/Taskforce/ArcDAT.cs
@@ -0,0 +1,78 @@
+//! \file       ArcDAT.cs
+//! \date       Tue Oct 25 01:48:10 2016
+//! \brief      Taskforce resource archive.
+//
+// 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 GameRes.Compression;
+
+namespace GameRes.Formats.Taskforce
+{
+    [Export(typeof(ArchiveFormat))]
+    public class DatOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "DAT/TASKFORCE"; } }
+        public override string Description { get { return "Taskforce engine resource archive"; } }
+        public override uint     Signature { get { return 0x666B7374; } } // 'tskf'
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (4, "orce"))
+                return null;
+            int count = file.View.ReadInt32 (8);
+            if (!IsSaneCount (count))
+                return null;
+
+            uint index_offset = 0xC;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                var name = file.View.ReadString (index_offset, 0x100);
+                var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                index_offset += 0x100;
+                entry.Offset        = file.View.ReadUInt32 (index_offset);
+                entry.UnpackedSize  = file.View.ReadUInt32 (index_offset+4);
+                entry.Size          = file.View.ReadUInt32 (index_offset+8);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                entry.IsPacked = entry.UnpackedSize != entry.Size;
+                dir.Add (entry);
+                index_offset += 0xC;
+            }
+            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 LzssStream (input);
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index c39cd263..673a89a6 100644
--- a/supported.html
+++ b/supported.html
@@ -576,6 +576,7 @@ Medorei ~Okasareta Houkago~<br/>
 Onna Kyoushi<br/>
 Ore to Kanojo wa Shuju na Kankei<br/>
 Saishuu Chikan Densha<br/>
+Saishuu Chikan Densha 2<br/>
 Saishuu Chikan Densha 3<br/>
 Serina<br/>
 Ura Nyuugaku ~Ineki ni Nureta Kyoukasho~<br/>
@@ -1216,10 +1217,14 @@ Tiara<br/>
 Tsumi no Hikari Rendezvous<br/>
 </td></tr>
 <tr class="odd"><td>arc.dat</td><td>-</td><td>No</td><td rowspan="2">AdvSys3</td><td rowspan="2">
+Jii Tousaku<br/>
 Okami Tsuma ~Ryokan Baito de no Himitsu~<br/>
 Tain Shoukougun<br/>
 </td></tr>
 <tr class="odd last"><td>*.gwd</td><td><tt>GWD</tt></td><td>No</td></tr>
+<tr><td>*.dat</td><td><tt>tskforce</tt></td><td>No</td><td>Taskforce</td><td>
+Musumaker<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>