diff --git a/ArcFormats/AnimeGameSystem/ArcDAT.cs b/ArcFormats/AnimeGameSystem/ArcDAT.cs
index af562c05..5d6397e6 100644
--- a/ArcFormats/AnimeGameSystem/ArcDAT.cs
+++ b/ArcFormats/AnimeGameSystem/ArcDAT.cs
@@ -2,7 +2,7 @@
 //! \date       Thu Nov 05 04:40:35 2015
 //! \brief      AnimeGameSystem resource archive.
 //
-// Copyright (C) 2015 by morkt
+// Copyright (C) 2015-2016 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
@@ -27,6 +27,8 @@ using System;
 using System.Collections.Generic;
 using System.ComponentModel.Composition;
 using System.IO;
+using GameRes.Formats.Properties;
+using GameRes.Formats.Strings;
 using GameRes.Utility;
 
 namespace GameRes.Formats.Ags
@@ -67,7 +69,102 @@ namespace GameRes.Formats.Ags
                 dir.Add (entry);
                 index_offset += 0x18;
             }
+            var arc_name = Path.GetFileName (file.Name);
+            if (EncryptedArchives.Contains (arc_name))
+            {
+                var options = Query<AgsOptions> (arcStrings.AGSMightBeEncrypted);
+                EncryptionKey key;
+                if (options.Scheme.FileMap.TryGetValue (arc_name, out key))
+                    return new DatArchive (file, this, dir, key);
+            }
             return new ArcFile (file, this, dir);
         }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var earc = arc as DatArchive;
+            if (null == earc)
+                return base.OpenEntry (arc, entry);
+            var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
+            byte key = earc.Key.Initial;
+            for (int i = 0; i < data.Length; ++i)
+            {
+                data[i] ^= key;
+                key += earc.Key.Increment;
+            }
+            return new MemoryStream (data);
+        }
+
+        public static readonly EncryptionScheme DefaultScheme = new EncryptionScheme {
+            FileMap = new Dictionary<string, EncryptionKey>()
+        };
+
+        public override ResourceOptions GetDefaultOptions ()
+        {
+            return new AgsOptions { Scheme = GetScheme (Settings.Default.AGSTitle) };
+        }
+
+        public override object GetAccessWidget ()
+        {
+            return new GUI.WidgetAGS();
+        }
+
+        public static EncryptionScheme GetScheme (string title)
+        {
+            EncryptionScheme scheme;
+            if (string.IsNullOrEmpty (title) || !KnownSchemes.TryGetValue (title, out scheme))
+                scheme = DefaultScheme;
+            return scheme;
+        }
+
+        public static Dictionary<string, EncryptionScheme> KnownSchemes = new Dictionary<string, EncryptionScheme>();
+        static HashSet<string> EncryptedArchives = new HashSet<string>();
+
+        public override ResourceScheme Scheme
+        {
+            get { return new AgsScheme { KnownSchemes = KnownSchemes, EncryptedArchives = EncryptedArchives }; }
+            set
+            {
+                var ags = (AgsScheme)value;
+                KnownSchemes = ags.KnownSchemes;
+                EncryptedArchives = ags.EncryptedArchives;
+            }
+        }
+    }
+
+    internal class DatArchive : ArcFile
+    {
+        public EncryptionKey Key;
+
+        public DatArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, EncryptionKey key)
+            : base (arc, impl, dir)
+        {
+            Key = key;
+        }
+    }
+
+    internal class AgsOptions : ResourceOptions
+    {
+        public EncryptionScheme Scheme;
+    }
+
+    [Serializable]
+    public struct EncryptionKey
+    {
+        public byte Initial;
+        public byte Increment;
+    }
+
+    [Serializable]
+    public class EncryptionScheme
+    {
+        public Dictionary<string, EncryptionKey> FileMap;
+    }
+
+    [Serializable]
+    public class AgsScheme : ResourceScheme
+    {
+        public Dictionary<string, EncryptionScheme> KnownSchemes;
+        public HashSet<string>                      EncryptedArchives;
     }
 }
diff --git a/ArcFormats/AnimeGameSystem/WidgetAGS.xaml b/ArcFormats/AnimeGameSystem/WidgetAGS.xaml
new file mode 100644
index 00000000..e8599cf2
--- /dev/null
+++ b/ArcFormats/AnimeGameSystem/WidgetAGS.xaml
@@ -0,0 +1,7 @@
+<StackPanel x:Class="GameRes.Formats.GUI.WidgetAGS"
+      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+      xmlns:p="clr-namespace:GameRes.Formats.Properties">
+    <ComboBox Name="Scheme" Width="180" ItemsSource="{Binding}"
+              SelectedValue="{Binding Source={x:Static p:Settings.Default}, Path=AGSTitle, Mode=TwoWay}"/>
+</StackPanel>
diff --git a/ArcFormats/AnimeGameSystem/WidgetAGS.xaml.cs b/ArcFormats/AnimeGameSystem/WidgetAGS.xaml.cs
new file mode 100644
index 00000000..b01aecc9
--- /dev/null
+++ b/ArcFormats/AnimeGameSystem/WidgetAGS.xaml.cs
@@ -0,0 +1,22 @@
+using System.Linq;
+using System.Windows.Controls;
+using GameRes.Formats.Ags;
+using GameRes.Formats.Strings;
+
+namespace GameRes.Formats.GUI
+{
+    /// <summary>
+    /// Interaction logic for WidgetAGS.xaml
+    /// </summary>
+    public partial class WidgetAGS : StackPanel
+    {
+        public WidgetAGS()
+        {
+            InitializeComponent();
+            var keys = new string[] { arcStrings.ArcNoEncryption };
+            Scheme.ItemsSource = keys.Concat (DatOpener.KnownSchemes.Keys.OrderBy (x => x));
+            if (-1 == Scheme.SelectedIndex)
+                Scheme.SelectedIndex = 0;
+        }
+    }
+}
diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 161bf0da..dc2833d2 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -67,6 +67,9 @@
     <Compile Include="Actgs\ArcDAT.cs" />
     <Compile Include="AliceSoft\ArcAFA.cs" />
     <Compile Include="AliceSoft\ArcALK.cs" />
+    <Compile Include="AnimeGameSystem\WidgetAGS.xaml.cs">
+      <DependentUpon>WidgetAGS.xaml</DependentUpon>
+    </Compile>
     <Compile Include="Ankh\ArcGRP.cs" />
     <Compile Include="ArcCG.cs" />
     <Compile Include="ArcZIP.cs" />
@@ -495,6 +498,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="AnimeGameSystem\WidgetAGS.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="AZSys\WidgetAZ.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
diff --git a/ArcFormats/Properties/Settings.Designer.cs b/ArcFormats/Properties/Settings.Designer.cs
index 374e085c..20d22d5b 100644
--- a/ArcFormats/Properties/Settings.Designer.cs
+++ b/ArcFormats/Properties/Settings.Designer.cs
@@ -513,5 +513,17 @@ namespace GameRes.Formats.Properties {
                 this["AZScriptScheme"] = value;
             }
         }
+        
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("")]
+        public string AGSTitle {
+            get {
+                return ((string)(this["AGSTitle"]));
+            }
+            set {
+                this["AGSTitle"] = value;
+            }
+        }
     }
 }
diff --git a/ArcFormats/Properties/Settings.settings b/ArcFormats/Properties/Settings.settings
index a4bf7820..7dd944dd 100644
--- a/ArcFormats/Properties/Settings.settings
+++ b/ArcFormats/Properties/Settings.settings
@@ -125,5 +125,8 @@
     <Setting Name="AZScriptScheme" Type="System.String" Scope="User">
       <Value Profile="(Default)" />
     </Setting>
+    <Setting Name="AGSTitle" Type="System.String" Scope="User">
+      <Value Profile="(Default)" />
+    </Setting>
   </Settings>
 </SettingsFile>
\ No newline at end of file
diff --git a/ArcFormats/Strings/arcStrings.Designer.cs b/ArcFormats/Strings/arcStrings.Designer.cs
index 7fa42da5..9e366265 100644
--- a/ArcFormats/Strings/arcStrings.Designer.cs
+++ b/ArcFormats/Strings/arcStrings.Designer.cs
@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.34209
+//     Runtime Version:4.0.30319.42000
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
@@ -60,6 +60,16 @@ namespace GameRes.Formats.Strings {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Archive contents might be encrypted,
+        ///choose appropriate encryption scheme..
+        /// </summary>
+        public static string AGSMightBeEncrypted {
+            get {
+                return ResourceManager.GetString("AGSMightBeEncrypted", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Base archive.
         /// </summary>
diff --git a/ArcFormats/Strings/arcStrings.ko-KR.resx b/ArcFormats/Strings/arcStrings.ko-KR.resx
index f045b63c..c163f8e7 100644
--- a/ArcFormats/Strings/arcStrings.ko-KR.resx
+++ b/ArcFormats/Strings/arcStrings.ko-KR.resx
@@ -372,4 +372,9 @@
     <value>Try to guess</value>
     <comment>translation pending</comment>
   </data>
+  <data name="AGSMightBeEncrypted" xml:space="preserve">
+    <value>Archive contents might be encrypted,
+choose appropriate encryption scheme.</value>
+    <comment>translation pending</comment>
+  </data>
 </root>
\ No newline at end of file
diff --git a/ArcFormats/Strings/arcStrings.resx b/ArcFormats/Strings/arcStrings.resx
index be6da685..f7e4df92 100644
--- a/ArcFormats/Strings/arcStrings.resx
+++ b/ArcFormats/Strings/arcStrings.resx
@@ -367,4 +367,8 @@ Choose appropriate encryption scheme.</value>
   <data name="YPFTryGuess" xml:space="preserve">
     <value>Try to guess</value>
   </data>
+  <data name="AGSMightBeEncrypted" xml:space="preserve">
+    <value>Archive contents might be encrypted,
+choose appropriate encryption scheme.</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/ArcFormats/Strings/arcStrings.ru-RU.resx b/ArcFormats/Strings/arcStrings.ru-RU.resx
index e6d367b0..a30709f2 100644
--- a/ArcFormats/Strings/arcStrings.ru-RU.resx
+++ b/ArcFormats/Strings/arcStrings.ru-RU.resx
@@ -117,6 +117,10 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="AGSMightBeEncrypted" xml:space="preserve">
+    <value>Содержимое архива может быть зашифровано,
+выберите подходящий способ шифрования.</value>
+  </data>
   <data name="AMIBaseArchive" xml:space="preserve">
     <value>Базовый архив</value>
   </data>
diff --git a/ArcFormats/Strings/arcStrings.zh-Hans.resx b/ArcFormats/Strings/arcStrings.zh-Hans.resx
index 679e1b67..0af35ec5 100644
--- a/ArcFormats/Strings/arcStrings.zh-Hans.resx
+++ b/ArcFormats/Strings/arcStrings.zh-Hans.resx
@@ -367,4 +367,9 @@
   <data name="YPFTryGuess" xml:space="preserve">
     <value>尝试猜测</value>
   </data>
+  <data name="AGSMightBeEncrypted" xml:space="preserve">
+    <value>Archive contents might be encrypted,
+choose appropriate encryption scheme.</value>
+    <comment>translation pending</comment>
+  </data>
 </root>
\ No newline at end of file
diff --git a/ArcFormats/app.config b/ArcFormats/app.config
index f3cb6ae3..02fbcabf 100644
--- a/ArcFormats/app.config
+++ b/ArcFormats/app.config
@@ -127,6 +127,9 @@
             <setting name="AZScriptScheme" serializeAs="String">
                 <value />
             </setting>
+            <setting name="AGSTitle" serializeAs="String">
+                <value />
+            </setting>
         </GameRes.Formats.Properties.Settings>
     </userSettings>
 <startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup></configuration>