diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index bfc93971..8ca55b88 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -126,6 +126,7 @@
     <Compile Include="AudioMIO.cs" />
     <Compile Include="AudioMP3.cs" />
     <Compile Include="AudioOGV.cs" />
+    <Compile Include="AudioPAD.cs" />
     <Compile Include="AudioPCM.cs" />
     <Compile Include="AudioPMW.cs" />
     <Compile Include="AudioWA1.cs" />
diff --git a/ArcFormats/AudioPAD.cs b/ArcFormats/AudioPAD.cs
new file mode 100644
index 00000000..fe0e51bc
--- /dev/null
+++ b/ArcFormats/AudioPAD.cs
@@ -0,0 +1,183 @@
+//! \file       AudioPAD.cs
+//! \date       Sun Jun 21 23:44:18 2015
+//! \brief      ShiinaRio compressed audio format.
+//
+// Copyright (C) 2015 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 GameRes.Utility;
+
+namespace GameRes.Formats.ShiinaRio
+{
+    [Export(typeof(AudioFormat))]
+    public class PadAudio : AudioFormat
+    {
+        public override string         Tag { get { return "PAD"; } }
+        public override string Description { get { return "ShiinaRio compressed audio format"; } }
+        public override uint     Signature { get { return 0x444150; } } // 'PAD'
+        
+        public override SoundInput TryOpen (Stream file)
+        {
+            var wav_header = new byte[0x2c];
+            if (0x2c != file.Read (wav_header, 0, 0x2c))
+                return null;
+            int pcm_size = LittleEndian.ToInt32 (wav_header, 0x28);
+            int channels = LittleEndian.ToUInt16 (wav_header, 0x16);
+            wav_header[0] = (byte)'R';
+            wav_header[1] = (byte)'I';
+            wav_header[2] = (byte)'F';
+            wav_header[3] = (byte)'F';
+            LittleEndian.Pack (pcm_size+0x24, wav_header, 4);
+
+            var decoder = new PadDecoder (file, pcm_size, channels);
+            decoder.Unpack();
+            var data = new MemoryStream (decoder.Data, 0, pcm_size);
+            var wav = new PrefixStream (wav_header, data);
+            try
+            {
+                return new WaveInput (wav);
+            }
+            catch
+            {
+                wav.Dispose();
+                throw;
+            }
+        }
+    }
+
+    internal class PadDecoder
+    {
+        byte[]      m_input;
+        byte[]      m_output;
+        int         m_pcm_size;
+        int         m_packed_size;
+        int         m_channels;
+
+        public byte[] Data { get { return m_output; } }
+
+        public PadDecoder (Stream input, int pcm_size, int channels)
+        {
+            m_packed_size = (int)(input.Length - input.Position);
+            m_pcm_size = pcm_size;
+            m_channels = channels;
+            m_output = new byte[pcm_size + 0x9c];
+            m_input = new byte[m_packed_size];
+            if (m_packed_size != input.Read (m_input, 0, m_packed_size))
+                throw new InvalidFormatException ("Unexpected end of file");
+        }
+
+        public byte[] Unpack ()
+        {
+            int v10;
+            double v3 = 0;
+            double v27 = 0;
+            double v28 = 0;
+            int v30 = 0;
+
+            var table = new double[69];
+            table[4] = 0.9375;  // 0x3FEE000000000000
+            table[6] = 1.796875; // 0x3FFCC00000000000
+            table[7] = -0.8125; // 0xBFEA000000000000
+            table[8] = 1.53125; // 0x3FF8800000000000
+            table[9] = -0.859375; // 0xBFEB800000000000
+            table[10] = 1.90625; // 0x3FFE800000000000
+            table[11] = -0.9375; // 0xBFEE000000000000
+
+            int dst = 0;
+            int src = 0;
+            int v5 = m_input[src++];
+            while (v5 != 0xff)
+            {
+                int v7 = m_input[src++];
+                int v29 = v7 >> 4;
+                int v9 = v7 & 0xF;
+                if (2 == m_channels)
+                {
+                    int next = m_input[src+1];
+                    v10 = next & 0xF;
+                    v30 = next >> 4;
+                    long v = BitConverter.DoubleToInt64Bits (table[12]) & 0xffffffff;
+                    table[12] = BitConverter.Int64BitsToDouble (v | (long)v10 << 32);
+                    src += 2;
+                }
+                else
+                {
+                    v10 = (int)(BitConverter.DoubleToInt64Bits (table[12]) >> 32);
+                }
+                int v12 = 14; // within table
+                for (int i = 0; i < 14; ++i)
+                {
+                    int v13 = m_input[src++];
+                    int v14 = (v13 & 0xF) << 12;
+                    if (0 != (v14 & 0x8000))
+                        v14 |= ~0xFFFF;
+                    int v15 = (v13 & 0xF0) << 8;
+                    table[v12 - 1] = (double)(v14 >> v9);
+                    if (0 != (v15 & 0x8000))
+                        v15 |= ~0xFFFF;
+                    table[v12] = (double)(v15 >> v9);
+                    v12 += 2;
+                }
+                if (2 == m_channels)
+                {
+                    v12 = 42; // within table
+                    for (int i = 0; i < 14; ++i)
+                    {
+                        int v18 = m_input[src++];
+                        int v19 = (v18 & 0xF) << 12;
+                        if (0 != (v19 & 0x8000))
+                            v19 |= ~0xFFFF;
+                        int v20 = (byte)(v18 & 0xF0) << 8;
+                        table[v12 - 1] = (double)(v19 >> v10);
+                        if (0 != (v20 & 0x8000))
+                            v20 |= ~0xFFFF;
+                        table[v12] = (double)(v20 >> v10);
+                        v12 += 2;
+                    }
+                }
+                v12 = 41; // within table
+                for (int i = 0; i < 28; ++i)
+                {
+                    double v22 = v27 * table[2 * v29 + 3];
+                    v27 = table[0];
+                    table[v12 - 28] += v22 + v27 * table[2 * v29 + 2];
+                    table[0] = table[v12 - 28];
+                    LittleEndian.Pack ((short)(table[v12 - 28] + 0.5), m_output, dst);
+                    dst += 2;
+                    if (2 == m_channels)
+                    {
+                        table[v12] += v28 * table[2 * v30 + 3] + v3 * table[2 * v30 + 2];
+                        v28 = v3;
+                        v3 = table[v12];
+                        LittleEndian.Pack ((short)(table[v12] + 0.5), m_output, dst);
+                        dst += 2;
+                    }
+                    ++v12;
+                }
+                v5 = m_input[src++];
+            }
+            return m_output;
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index 41d8b480..40508b80 100644
--- a/supported.html
+++ b/supported.html
@@ -146,13 +146,15 @@ Onsen Kankou Yukemuri Chijou<br/>
 <tr><td>*.pt1</td><td>-</td><td>No</td></tr>
 <tr class="odd"><td>*.pak</td><td><tt>DataPack5</tt><br/><tt>GsPack4</tt></td><td>No</td><td rowspan="2">Root</td><td rowspan="2">Para-Sol</td></tr>
 <tr class="odd"><td>*</td><td><tt>\x00\x00\x04\x00</tt></td><td>No</td></tr>
-<tr><td>*.war</td><td><tt>WARC 1.7</tt></td><td>No</td><td rowspan="3">Shiina Rio</td><td rowspan="3">
+<tr><td>*.war</td><td><tt>WARC 1.7</tt><br/><tt>WARC 1.3</tt></td><td>No</td><td rowspan="4">Shiina Rio</td><td rowspan="4">
 Classmate no Okaa-san<br/>
 Helter Skelter<br/>
 Mahou Shoujo no Taisetsu na Koto<br/>
+Itsuka, Dokoka de ~Ano Ameoto no Kioku~<br/>
 </td></tr>
 <tr><td>*.s25</td><td><tt>S25</tt></td><td>No</td></tr>
 <tr><td>*.ogv</td><td><tt>OGV</tt></td><td>No</td></tr>
+<tr><td>*.pad</td><td><tt>PAD</tt></td><td>No</td></tr>
 <tr class="odd"><td>*</td><td><tt>ARC2</tt><br/><tt>ARC1</tt></td><td>No</td><td>AST</td><td>Jokyoushi wo Kurau</td></tr>
 <tr><td>*.dat</td><td>-</td><td>No</td><td>Ail</td><td>Ragna☆彡Science</td></tr>
 <tr class="odd"><td>*.lpk</td><td><tt>LPK1</tt></td><td>No</td><td rowspan="2">Lucifen</td><td rowspan="2">
@@ -197,6 +199,7 @@ Onna Kyoushi
 X Change R<br/>
 X Change<br/>
 X Change 2<br/>
+X Change 2R<br/>
 </td></tr>
 <tr class="odd"><td>*.cwp</td><td><tt>CWDP</tt></td><td>Yes</td></tr>
 <tr class="odd"><td>*.cwd</td><td><tt>cwd</tt></td><td>No</td></tr>