diff --git a/ArcFormats/UMeSoft/ArcMGX.cs b/ArcFormats/UMeSoft/ArcMGX.cs
new file mode 100644
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+++ b/ArcFormats/UMeSoft/ArcMGX.cs
@@ -0,0 +1,126 @@
+//! \file       ArcMGX.cs
+//! \date       2018 May 20
+//! \brief      U-Me Soft multi-frame image.
+//
+// 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;
+
+namespace GameRes.Formats.UMeSoft
+{
+    [Export(typeof(ArchiveFormat))]
+    public class MgxOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "MGX"; } }
+        public override string Description { get { return "U-Me Soft multi-frame image"; } }
+        public override uint     Signature { get { return 0x1A58474D; } } // 'MGX'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public MgxOpener ()
+        {
+            Extensions = new string[] { "grx" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (4);
+            if (!IsSaneCount (count))
+                return null;
+            var base_name = Path.GetFileNameWithoutExtension (file.Name);
+            int index_offset = 8;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                var entry = new Entry {
+                    Name = string.Format ("{0}#{1:D4}.GRX", base_name, i),
+                    Type = "image",
+                    Offset = file.View.ReadUInt32 (index_offset),
+                };
+                index_offset += 4;
+                if (entry.Offset > file.MaxOffset)
+                    return null;
+                dir.Add (entry);
+            }
+            for (int i = 1; i < count; ++i)
+                dir[i-1].Size = (uint)(dir[i].Offset - dir[i-1].Offset);
+            dir[count-1].Size = (uint)(file.MaxOffset - dir[count-1].Offset);
+            return new ArcFile (file, this, dir);
+        }
+    }
+
+    internal class MgxMetaData : GrxMetaData
+    {
+        public uint GrxOffset;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class MgxFormat : GrxFormat
+    {
+        public override string         Tag { get { return "MGX"; } }
+        public override string Description { get { return "U-Me Soft multi-frame image"; } }
+        public override uint     Signature { get { return 0x1A58474D; } } // 'MGX'
+
+        public MgxFormat ()
+        {
+            Extensions = new string[] { "grx" };
+        }
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (12);
+            uint first_offset = header.ToUInt32 (8);
+            file.Position = first_offset;
+            if (file.ReadUInt32() != 0x1A585247) // 'GRX'
+                return null;
+            var info = ReadInfo (file);
+            return new MgxMetaData {
+                Width    = info.Width,
+                Height   = info.Height,
+                BPP      = info.BPP,
+                IsPacked = info.IsPacked,
+                HasAlpha = info.HasAlpha,
+                AlphaOffset = info.AlphaOffset,
+                GrxOffset = first_offset,
+            };
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var meta = (MgxMetaData)info;
+            using (var input = new StreamRegion (file.AsStream, meta.GrxOffset, true))
+            {
+                var reader = new Reader (input, meta);
+                reader.Unpack();
+                return ImageData.Create (info, reader.Format, null, reader.Data, reader.Stride);
+            }
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("MgxFormat.Write not implemented");
+        }
+    }
+}