diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index c5f9b2c0..b20b6c70 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -132,6 +132,7 @@
     <Compile Include="Cyberworks\ImageTB1.cs" />
     <Compile Include="DaiSystem\ArcPAC.cs" />
     <Compile Include="DirectDraw\DxtDecoder.cs" />
+    <Compile Include="DjSystem\ArcDAT.cs" />
     <Compile Include="elf\ArcAi5DAT.cs" />
     <Compile Include="elf\ImageRMT.cs" />
     <Compile Include="Emote\ImageDREF.cs" />
diff --git a/ArcFormats/DjSystem/ArcDAT.cs b/ArcFormats/DjSystem/ArcDAT.cs
new file mode 100644
index 00000000..0eae5a11
--- /dev/null
+++ b/ArcFormats/DjSystem/ArcDAT.cs
@@ -0,0 +1,103 @@
+//! \file       ArcDAT.cs
+//! \date       2018 Mar 12
+//! \brief      DJSYSTEM resource archive.
+//
+// Copyright (C) 2018 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.Text.RegularExpressions;
+
+namespace GameRes.Formats.DjSystem
+{
+    [Export(typeof(ArchiveFormat))]
+    public class DatOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "DAT/DJSYSTEM"; } }
+        public override string Description { get { return "DJSYSTEM engine resource archive"; } }
+        public override uint     Signature { get { return 0x454C4946; } } // 'FILE'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        static readonly Regex IndexEntryRe = new Regex (@"^(\S+)\t(\d+)\s*\t(\d+)");
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (0, "FILECMB-DATA-LIST-IN\n"))
+                return null;
+            using (var input = file.CreateStream())
+            using (var index = new StreamReader (input, Encodings.cp932))
+            {
+                var dir = new List<Entry>();
+                index.ReadLine();
+                for (;;)
+                {
+                    var line = index.ReadLine();
+                    if (null == line || "LIST-END" == line)
+                        break;
+                    var match = IndexEntryRe.Match (line);
+                    if (!match.Success)
+                        return null;
+                    var name   = match.Groups[1].Value;
+                    uint start = UInt32.Parse (match.Groups[2].Value);
+                    uint end   = UInt32.Parse (match.Groups[3].Value);
+                    var entry = FormatCatalog.Instance.Create<Entry> (name);
+                    entry.Offset = start;
+                    entry.Size   = end - start;
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    dir.Add (entry);
+                }
+                if (0 == dir.Count)
+                    return null;
+                return new ArcFile (file, this, dir);
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            if (arc.File.View.AsciiEqual (entry.Offset, "DJCODE NLINE-"))
+            {
+                if (arc.File.View.AsciiEqual (entry.Offset+13, "ENCODE\n"))
+                {
+                    var input = arc.File.CreateStream (entry.Offset+20, entry.Size-20);
+                    return new XoredStream (input, 0xFF);
+                }
+                else if (arc.File.View.AsciiEqual (entry.Offset+13, "NO-ENCODE\n"))
+                {
+                    var data = arc.File.View.ReadBytes (entry.Offset+23, entry.Size-23);
+                    for (int i = 0; i < data.Length; ++i)
+                    {
+                        if (data[i] == '\r' && i+1 < data.Length && data[i+1] == '\n')
+                            ++i;
+                        else
+                            data[i] ^= 0xFF;
+                    }
+                    return new BinMemoryStream (data, entry.Name);
+                }
+            }
+            return base.OpenEntry (arc, entry);
+        }
+    }
+}