diff --git a/Legacy/Mink/ImageGDF.cs b/Legacy/Mink/ImageGDF.cs
new file mode 100644
index 00000000..4982a52e
--- /dev/null
+++ b/Legacy/Mink/ImageGDF.cs
@@ -0,0 +1,54 @@
+//! \file       ImageGDF.cs
+//! \date       2017 Dec 29
+//! \brief      Obfuscated BMP file.
+//
+// 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.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.Mink
+{
+    [Export(typeof(ImageFormat))]
+    public class GdfFormat : MbImageFormat
+    {
+        public override string         Tag { get { return "GDF"; } }
+        public override string Description { get { return "Mink obfuscated bitmap"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream stream)
+        {
+            int c1 = stream.ReadByte();
+            int c2 = stream.ReadByte();
+            if ('G' != c1 || 'D' != c2)
+                return null;
+            using (var bmp = OpenAsBitmap (stream))
+                return Bmp.ReadMetaData (bmp);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("GdfFormat.Write not implemented");
+        }
+    }
+}