diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 00e64f3f..fc89c2a2 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -97,6 +97,7 @@
     <Compile Include="KiriKiri\ChainReactionCrypt.cs" />
     <Compile Include="Liar\ImageLIM.cs" />
     <Compile Include="MnoViolet\ImageDIF.cs" />
+    <Compile Include="Nexas\ImageGRP.cs" />
     <Compile Include="NitroPlus\ArcNPK.cs" />
     <Compile Include="NonColor\ArcDAT.cs" />
     <Compile Include="Crc64.cs" />
@@ -276,7 +277,7 @@
     <Compile Include="MnoViolet\ArcMnoViolet.cs" />
     <Compile Include="FC01\ArcMRG.cs" />
     <Compile Include="ArcNEKO.cs" />
-    <Compile Include="ArcNexas.cs" />
+    <Compile Include="Nexas\ArcPAC.cs" />
     <Compile Include="NitroPlus\ArcNitro.cs" />
     <Compile Include="Entis\ArcNOA.cs" />
     <Compile Include="NitroPlus\ArcNPA.cs" />
diff --git a/ArcFormats/Nexas/ImageGRP.cs b/ArcFormats/Nexas/ImageGRP.cs
new file mode 100644
index 00000000..95d6e4d0
--- /dev/null
+++ b/ArcFormats/Nexas/ImageGRP.cs
@@ -0,0 +1,143 @@
+//! \file       ImageGRP.cs
+//! \date       Fri May 20 20:30:01 2016
+//! \brief      NeXAS GRP image format.
+//
+// Copyright (C) 2016 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.NeXAS
+{
+    internal class GrpMetaData : ImageMetaData
+    {
+        public int  UnpackedSize;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class GrpFormat : ImageFormat
+    {
+        public override string         Tag { get { return "GR3"; } }
+        public override string Description { get { return "NeXAS engine image format"; } }
+        public override uint     Signature { get { return 0x18335247; } }
+
+        public GrpFormat ()
+        {
+            Extensions = new string[] { "grp" };
+        }
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            var header = new byte[0x11];
+            if (header.Length != stream.Read (header, 0, header.Length))
+                return null;
+            return new GrpMetaData
+            {
+                Width   = LittleEndian.ToUInt32 (header, 5),
+                Height  = LittleEndian.ToUInt32 (header, 9),
+                BPP     = LittleEndian.ToUInt16 (header, 3),
+                UnpackedSize = LittleEndian.ToInt32 (header, 0xD),
+            };
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            using (var reader = new GrpReader (stream, (GrpMetaData)info))
+            {
+                reader.Unpack();
+                return ImageData.Create (info, reader.Format, null, reader.Data);
+            }
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("GrpFormat.Write not implemented");
+        }
+    }
+
+    internal sealed class GrpReader : IDisposable
+    {
+        BinaryReader    m_input;
+        byte[]          m_output;
+
+        public byte[]        Data { get { return m_output; } }
+        public PixelFormat Format { get; private set; }
+
+        public GrpReader (Stream input, GrpMetaData info)
+        {
+            m_input = new ArcView.Reader (input);
+            m_output = new byte[info.UnpackedSize];
+            if (24 == info.BPP)
+                Format = PixelFormats.Bgr24;
+            else if (32 == info.BPP)
+                Format = PixelFormats.Bgr32;
+            else
+                throw new NotSupportedException ("Not supported GRP image color depth");
+        }
+
+        public void Unpack ()
+        {
+            m_input.BaseStream.Position = 0x11;
+            int ctl_length = (m_input.ReadInt32() + 7) / 8;
+            var ctl_bytes = m_input.ReadBytes (ctl_length);
+            m_input.ReadInt32();
+            using (var ctl_mem = new MemoryStream (ctl_bytes))
+            using (var bits = new LsbBitStream (ctl_mem))
+            {
+                int dst = 0;
+                while (dst < m_output.Length)
+                {
+                    int bit = bits.GetNextBit();
+                    if (-1 == bit)
+                        break;
+                    if (0 == bit)
+                    {
+                        m_output[dst++] = m_input.ReadByte();
+                    }
+                    else
+                    {
+                        int offset = m_input.ReadUInt16();
+                        int count = (offset & 7) + 1;
+                        offset = (offset >> 3) + 1;
+                        Binary.CopyOverlapped (m_output, dst - offset, dst, count);
+                        dst += count;
+                    }
+                }
+            }
+        }
+
+        #region IDisposable Members
+        bool _disposed = false;
+        public void Dispose ()
+        {
+            if (!_disposed)
+            {
+                m_input.Dispose();
+                _disposed = true;
+            }
+        }
+        #endregion
+    }
+}
diff --git a/supported.html b/supported.html
index 1bf32f74..017bb0bf 100644
--- a/supported.html
+++ b/supported.html
@@ -154,12 +154,13 @@ Binary Pot<br/>
 Tsukihime<br/>
 Umineko<br/>
 </td></tr>
-<tr><td>*.pac</td><td><tt>PAC</tt></td><td>No</td><td>NeXAS</td><td>
+<tr><td>*.pac</td><td><tt>PAC</tt></td><td>No</td><td rowspan="2">NeXAS</td><td rowspan="2">
 Baldr Sky DiveX<br/>
 Fossette ~Cafe au Le Ciel Bleu~<br/>
 Jinki Extend Re:Vision<br/>
 Maji de Watashi ni Koishinasai!<br/>
 </td></tr>
+<tr><td>*.grp</td><td><tt>GR3</tt></td><td>No</td></tr>
 <tr class="odd"><td>*.pac</td><td><tt>PAC1</tt></td><td>No</td><td rowspan="2">RAGE</td><td rowspan="2">
 Brightia Plus<br/>
 Hana Hiraku<br/>