diff --git a/ArcFormats/Tactics/ArcYU.cs b/ArcFormats/Tactics/ArcYU.cs
new file mode 100644
index 00000000..a17aa6de
--- /dev/null
+++ b/ArcFormats/Tactics/ArcYU.cs
@@ -0,0 +1,105 @@
+//! \file       ArcYU.cs
+//! \date       2017 Dec 28
+//! \brief      Old Tactics resource archive.
+//
+// Copyright (C) 2017 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.Utility;
+
+namespace GameRes.Formats.Tactics
+{
+    internal class YuEntry : Entry
+    {
+        public byte ContentType;
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class YuOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "ARC/Tactics/0"; } }
+        public override string Description { get { return "Tactics resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        const byte DefaultKey = 0x55;
+
+        static readonly string[] IndexExtensions = new string[] { ".dll" };
+        static readonly string[] KnownTypes = new string[] { "bmp", "jpg" };
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            string lst_name = IndexExtensions.Select (ext => file.Name + ext)
+                .FirstOrDefault (name => VFS.FileExists (name));
+            if (null == lst_name)
+                return null;
+            using (var lst = VFS.OpenBinaryStream (lst_name))
+            {
+                const int name_length = 0x41;
+                var dir = new List<Entry>();
+                var name_buffer = new byte[name_length];
+                while (lst.Read (name_buffer, 0, name_length) == name_length)
+                {
+                    int name_end;
+                    for (name_end = 0; name_end < name_length; ++name_end)
+                    {
+                        if (0 == name_buffer[name_end])
+                            break;
+                        name_buffer[name_end] ^= DefaultKey;
+                    }
+                    var name = Binary.GetCString (name_buffer, 0, name_end);
+                    uint offset = lst.ReadUInt32();
+                    if (offset > file.MaxOffset)
+                        return null;
+                    byte type = lst.ReadUInt8();
+                    if (type < KnownTypes.Length)
+                        name = Path.ChangeExtension (name, KnownTypes[type]);
+                    var entry = FormatCatalog.Instance.Create<YuEntry> (name);
+                    entry.Offset = offset;
+                    entry.ContentType = type;
+                    dir.Add (entry);
+                }
+                if (0 == dir.Count)
+                    return null;
+                for (int i = 0; i < dir.Count; ++i)
+                {
+                    long next_offset = i + 1 == dir.Count ? file.MaxOffset : dir[i+1].Offset;
+                    dir[i].Size = (uint)(next_offset - dir[i].Offset);
+                }
+                return new ArcFile (file, this, dir);
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            var yent = entry as YuEntry;
+            if (null == yent || yent.ContentType != 3)
+                return input;
+            return new XoredStream (input, DefaultKey);
+        }
+    }
+}