diff --git a/ArcFormats/Mixwill/ImageMWP.cs b/ArcFormats/Mixwill/ImageMWP.cs
deleted file mode 100644
index 975f0609..00000000
--- a/ArcFormats/Mixwill/ImageMWP.cs
+++ /dev/null
@@ -1,63 +0,0 @@
-//! \file       ImageMWP.cs
-//! \date       2018 Jun 18
-//! \brief      Mixwill 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.ComponentModel.Composition;
-using System.IO;
-using System.Windows.Media;
-
-// [050225][Mixwill Soft] Chibusa Byoutou
-
-namespace GameRes.Formats.Mixwill
-{
-    [Export(typeof(ImageFormat))]
-    public class MwpFormat : ImageFormat
-    {
-        public override string         Tag { get { return "MWP"; } }
-        public override string Description { get { return "Mixwill image format"; } }
-        public override uint     Signature { get { return 0x1050574D; } } // 'MWP'
-
-        public override ImageMetaData ReadMetaData (IBinaryStream file)
-        {
-            var header = file.ReadHeader (12);
-            return new ImageMetaData {
-                Width = header.ToUInt32 (4),
-                Height = header.ToUInt32 (8),
-                BPP = 32,
-            };
-        }
-
-        public override ImageData Read (IBinaryStream file, ImageMetaData info)
-        {
-            file.Position = 12;
-            var pixels = file.ReadBytes (4 * (int)info.Width * (int)info.Height);
-            return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
-        }
-
-        public override void Write (Stream file, ImageData image)
-        {
-            throw new System.NotImplementedException ("MwpFormat.Write not implemented");
-        }
-    }
-}