diff --git a/ArcFormats/Zyx/ImageMTL.cs b/ArcFormats/Zyx/ImageMTL.cs
new file mode 100644
index 00000000..66f813ce
--- /dev/null
+++ b/ArcFormats/Zyx/ImageMTL.cs
@@ -0,0 +1,168 @@
+//! \file       ImageMTL.cs
+//! \date       2018 May 26
+//! \brief      Zyx image format.
+//
+// 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.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Zyx
+{
+    internal class MtlMetaData : ImageMetaData
+    {
+        public long     DataOffset;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class MtlFormat : ImageFormat
+    {
+        public override string         Tag { get { return "MTL"; } }
+        public override string Description { get { return "Zyx image format"; } }
+        public override uint     Signature { get { return 0x4154454D; } } // 'METAL'
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (0x2C);
+            if (!header.AsciiEqual ("METAL") || header.ToInt32 (0x10) != 0x28 || header[0x15] == 0)
+                return null;
+            int name_length = header.ToInt32 (0x28);
+            if (name_length <= 0)
+                return null;
+            var name = file.ReadCString (name_length);
+            if (file.ReadInt32() != 0xC)
+                return null;
+            int frame_count = file.ReadInt32();
+            if (!ArchiveFormat.IsSaneCount (frame_count))
+                return null;
+            var data_pos = file.Position + frame_count * 0x18;
+            return new MtlMetaData {
+                Width  = header.ToUInt32 (0x20),
+                Height = header.ToUInt32 (0x24),
+                BPP    = 32,
+                DataOffset = data_pos,
+            };
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var reader = new MtlReader (file, (MtlMetaData)info);
+            var pixels = reader.Unpack();
+            return ImageData.Create (info, reader.Format, null, pixels);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("MtlFormat.Write not implemented");
+        }
+    }
+
+    internal class MtlReader
+    {
+        IBinaryStream   m_input;
+        MtlMetaData     m_info;
+        byte[]          m_output;
+
+        public PixelFormat Format { get; private set; }
+        public byte[]        Data { get { return m_output; } }
+
+        public MtlReader (IBinaryStream input, MtlMetaData info)
+        {
+            m_input = input;
+            m_info = info;
+            m_output = new byte[m_info.Width * m_info.Height * 4];
+            Format = PixelFormats.Bgr32;
+        }
+
+        public byte[] Unpack ()
+        {
+            int stride = (int)m_info.Width * 4;
+            var offsets = new int[] { 4, stride, stride + 4, stride - 4 };
+
+            m_input.Position = m_info.DataOffset;
+            int dst = 0;
+            while (dst < m_output.Length)
+            {
+                byte ctl = m_input.ReadUInt8();
+                int count = 0;
+                if (0 == (ctl & 0x80))
+                {
+                    count = (ctl & 0x7F) + 1;
+                    int pos = 0;
+                    for (int i = 0; i < count; ++i)
+                    {
+                        m_input.Read (m_output, dst + pos, 3);
+                        pos += 4;
+                    }
+                }
+                else if (0x80 == (ctl & 0xC0))
+                {
+                    count = (ctl & 0x3F) + 1;
+                }
+                else if (0xC0 == (ctl & 0xE0))
+                {
+                    count = (ctl & 0x1F) + 1;
+                    m_input.Read (m_output, dst, 3);
+                    Binary.CopyOverlapped (m_output, dst, dst + 4, count * 4);
+                    ++count;
+                }
+                else if (0xE0 == (ctl & 0xF0))
+                {
+                    count = 1;
+                    int offset = offsets[ctl & 3];
+                    Buffer.BlockCopy (m_output, dst - offset, m_output, dst, 4);
+                }
+                else if (0xF0 == (ctl & 0xF0))
+                {
+                    int offset = 0;
+                    if (0 != (ctl & 1))
+                    {
+                        offset = m_input.ReadUInt16();
+                    }
+                    else
+                    {
+                        offset = m_input.ReadUInt8();
+                    }
+                    if (8 == (ctl & 8))
+                    {
+                        if (0 != (ctl & 2))
+                        {
+                            count = m_input.ReadUInt16();
+                        }
+                        else
+                        {
+                            count = m_input.ReadUInt8();
+                        }
+                    }
+                    ++offset;
+                    ++count;
+                    Binary.CopyOverlapped (m_output, dst - offset * 4, dst, count * 4);
+                }
+                dst += count * 4;
+            }
+            return m_output;
+        }
+    }
+}