diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 331ca323..13aaa5d5 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -73,6 +73,7 @@
     <Compile Include="Ankh\ArcGRP.cs" />
     <Compile Include="Aoi\ImageAGF.cs" />
     <Compile Include="ArcCG.cs" />
+    <Compile Include="Astronauts\ArcGXP.cs" />
     <Compile Include="Banana\ImageGEC.cs" />
     <Compile Include="BlackRainbow\ArcPAK.cs" />
     <Compile Include="Cmvs\ArcPBZ.cs" />
diff --git a/ArcFormats/Astronauts/ArcGXP.cs b/ArcFormats/Astronauts/ArcGXP.cs
new file mode 100644
index 00000000..fe09fd20
--- /dev/null
+++ b/ArcFormats/Astronauts/ArcGXP.cs
@@ -0,0 +1,100 @@
+//! \file       ArcGXP.cs
+//! \date       Thu Jun 30 08:17:12 2016
+//! \brief      Astronauts resource archive.
+//
+// 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.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Text;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Astronauts
+{
+    [Export(typeof(ArchiveFormat))]
+    public class PakOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "GXP"; } }
+        public override string Description { get { return "Astronauts resource archive"; } }
+        public override uint     Signature { get { return 0x505847; } } // 'GXP'
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool     CanCreate { get { return false; } }
+
+        static readonly byte[] KnownKey = {
+            0x40, 0x21, 0x28, 0x38, 0xA6, 0x6E, 0x43, 0xA5, 0x40, 0x21, 0x28, 0x38, 0xA6, 0x43, 0xA5, 0x64,
+            0x3E, 0x65, 0x24, 0x20, 0x46, 0x6E, 0x74,
+        };
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (0x18);
+            if (!IsSaneCount (count))
+                return null;
+
+            long base_offset = file.View.ReadInt64 (0x28);
+            uint entry_key = KnownKey[0] | (1u^KnownKey[1]) << 8 | (2u^KnownKey[2]) << 16 | (3u^KnownKey[3]) << 24;
+            uint index_offset = 0x30;
+            var entry_buffer = new byte[0x100];
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                var entry_length = file.View.ReadUInt32 (index_offset) ^ entry_key;
+                if (entry_length < 0x20 || entry_length > 0x1000)
+                    return null;
+                if (entry_length > entry_buffer.Length)
+                    entry_buffer = new byte[entry_length];
+                if (entry_length != file.View.Read (index_offset, entry_buffer, 0, entry_length))
+                    return null;
+                Decrypt (entry_buffer, entry_length);
+                int name_length = LittleEndian.ToInt32 (entry_buffer, 0xC) * 2; // length in characters
+                if (name_length >= entry_length)
+                    return null;
+                var name = Encoding.Unicode.GetString (entry_buffer, 0x20, name_length);
+                var entry = FormatCatalog.Instance.Create<Entry> (name);
+                entry.Offset = base_offset + LittleEndian.ToInt64 (entry_buffer, 0x18);
+                entry.Size   = LittleEndian.ToUInt32 (entry_buffer, 4); // length is 64-bit actually
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                index_offset += entry_length;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
+            Decrypt (data, entry.Size);
+            return new MemoryStream (data);
+        }
+
+        static void Decrypt (byte[] data, uint length)
+        {
+            for (uint i = 0; i < length; ++i)
+            {
+                data[i] ^= (byte)(i ^ KnownKey[i % KnownKey.Length]);
+            }
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index 67559a2d..2ed798fd 100644
--- a/supported.html
+++ b/supported.html
@@ -222,6 +222,7 @@ Crime Rhyme series<br/>
 Damegane<br/>
 Distance<br/>
 ExE<br/>
+Fair Child<br/>
 Fate/stay night<br/>
 Fate/hollow ataraxia<br/>
 G-senjou no Maou<br/>
@@ -256,6 +257,7 @@ Zecchou Spiral!!<br/>
 <tr class="odd"><td>*.ypf</td><td><tt>YPF</tt></td><td>Yes</td><td rowspan="2">YU-RIS</td><td rowspan="2">
 Eroge! ~H mo Game mo Kaihatsu Zanmai~<br/>
 Mamono Musume-tachi to no Rakuen ~Slime &amp; Scylla~<br/>
+Mashou no Nie 3 ~Hakudaku no Umi ni Shizumu Injoku no Reiki~<br/>
 Sei Monmusu Festival!!<br/>
 Shin Chikan Ou<br/>
 Unionism Quartet<br/>
@@ -584,6 +586,7 @@ Zettai★Maou ~Boku no Mune-kyun Gakuen Saga~<br/>
 </td></tr>
 <tr><td>*.sud</td><td>-</td><td>No</td><td rowspan="3">Triangle</td><td rowspan="3">
 Kourin Tenshi En Ciel Rena<br/>
+Mahou Senshi Sweet Knights ~Heroine Ryoujoku Shirei~<br/>
 Mamagoto<br/>
 Vampire Crusaders<br/>
 </td></tr>
@@ -915,6 +918,9 @@ Karen<br/>
 Ingoku Chikan Ressha<br/>
 Peropero Saimin 3 Raouden ~Yousei no Sakuryaku~<br/>
 </td></tr>
+<tr class="odd"><td>*.gxp</td><td><tt>GXP</tt></td><td>No</td><td>Astronauts</td><td>
+Demonion 2 ~Maou to Sannin no Joou~<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>