diff --git a/ArcFormats/ArcTactics.cs b/ArcFormats/ArcTactics.cs
new file mode 100644
index 00000000..00903ba9
--- /dev/null
+++ b/ArcFormats/ArcTactics.cs
@@ -0,0 +1,124 @@
+//! \file       ArcTactics.cs
+//! \date       Thu Jul 23 16:27:55 2015
+//! \brief      Tactics archive file implementation.
+//
+// Copyright (C) 2015 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 System.Linq;
+using System.Security.Cryptography;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Tactics
+{
+    internal class TacticsArcFile : ArcFile
+    {
+        public byte[] Password;
+
+        public TacticsArcFile (ArcView file, ArchiveFormat format, ICollection<Entry> dir, byte[] pass)
+            : base (file, format, dir)
+        {
+            Password = pass;
+        }
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class ArcOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "ARC/Tactics"; } }
+        public override string Description { get { return "Tactics archive file"; } }
+        public override uint     Signature { get { return 0x54434154; } } // 'TACT'
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public ArcOpener ()
+        {
+            Extensions = new string[] { "arc" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (4, "ICS_ARC_FILE"))
+                return null;
+            uint packed_size = file.View.ReadUInt32 (0x10);
+            uint unpacked_size = file.View.ReadUInt32 (0x14);
+            int count = file.View.ReadInt32 (0x18);
+            if (!IsSaneCount (count))
+                return null;
+
+            var index = new byte[unpacked_size];
+            using (var input = file.CreateStream (0x20, packed_size))
+            using (var xored = new CryptoStream (input, new NotTransform(), CryptoStreamMode.Read))
+            using (var lzss = new LzssStream (xored))
+                lzss.Read (index, 0, index.Length);
+
+            int index_offset = Array.IndexOf (index, (byte)0);
+            if (-1 == index_offset || 0 == index_offset)
+                return null;
+            var password = index.Take (index_offset++).ToArray();
+            long base_offset = 0x20 + packed_size;
+            
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                var entry = new PackedEntry();
+                entry.Offset = LittleEndian.ToUInt32 (index, index_offset) + base_offset;
+                entry.Size   = LittleEndian.ToUInt32 (index, index_offset + 4);
+                entry.UnpackedSize = LittleEndian.ToUInt32 (index, index_offset + 8);
+                entry.IsPacked = entry.UnpackedSize != 0;
+                int name_len = LittleEndian.ToInt32 (index, index_offset + 0xC);
+                entry.Name = Encodings.cp932.GetString (index, index_offset+0x18, name_len);
+                entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                index_offset += 0x18 + name_len;
+            }
+            return new TacticsArcFile (file, this, dir, password);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var tarc = arc as TacticsArcFile;
+            if (null == tarc)
+                return arc.File.CreateStream (entry.Offset, entry.Size);
+
+            var data = new byte[entry.Size];
+            arc.File.View.Read (entry.Offset, data, 0, entry.Size);
+            int p = 0;
+            for (int i = 0; i < data.Length; ++i)
+            {
+                data[i] ^= tarc.Password[p++];
+                if (p == tarc.Password.Length)
+                    p = 0;
+            }
+            var input = new MemoryStream (data);
+            var tent = entry as PackedEntry;
+            if (null == tent || !tent.IsPacked)
+                return input;
+            return new LzssStream (input);
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index 48d4e8f6..b33318d6 100644
--- a/supported.html
+++ b/supported.html
@@ -264,6 +264,9 @@ Fetish 2: Omote no Kioku/Ura no Kioku<br/>
 Shinsetsu Ryouki no Ori<br/>
 </td></tr>
 <tr><td>*.gr2</td><td><tt>GR2_</tt><br/><tt>*Pola*</tt></td><td>No</td></tr>
+<tr class="odd"><td>*.arc</td><td><tt>TACTICS_ARC_FILE</tt></td><td>No</td><td>Nexton/Tactics</td><td>
+Gokudou no Hanayome<br/>
+</td></tr>
 </table>
 <p><a name="note-1">[1]</a> Non-encrypted only</p>
 </body>