diff --git a/ArcFormats/AZSys/ArcAZSys.cs b/ArcFormats/AZSys/ArcAZSys.cs
index b8b96704..53d6c7af 100644
--- a/ArcFormats/AZSys/ArcAZSys.cs
+++ b/ArcFormats/AZSys/ArcAZSys.cs
@@ -2,7 +2,7 @@
 //! \date       Wed Apr 22 09:52:23 2015
 //! \brief      AZ system archive implementation.
 //
-// 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
@@ -28,11 +28,34 @@ using System.Collections.Generic;
 using System.ComponentModel.Composition;
 using System.IO;
 using GameRes.Compression;
+using GameRes.Formats.Properties;
 using GameRes.Formats.Strings;
 using GameRes.Utility;
 
 namespace GameRes.Formats.AZSys
 {
+    [Serializable]
+    public class AsbScheme : ResourceScheme
+    {
+        public Dictionary<string, uint> KnownKeys;
+    }
+
+    internal class AsbOptions : ResourceOptions
+    {
+        public uint AsbKey;
+    }
+
+    internal class AsbArchive : ArcFile
+    {
+        public readonly uint Key;
+
+        public AsbArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, uint key)
+            : base (arc, impl, dir)
+        {
+            Key = key;
+        }
+    }
+
     [Export(typeof(ArchiveFormat))]
     public class ArcOpener : ArchiveFormat
     {
@@ -47,6 +70,14 @@ namespace GameRes.Formats.AZSys
             Extensions = new string[] { "arc" };
         }
 
+        public static Dictionary<string, uint> KnownKeys = new Dictionary<string, uint>();
+
+        public override ResourceScheme Scheme
+        {
+            get { return new AsbScheme { KnownKeys = KnownKeys }; }
+            set { KnownKeys = ((AsbScheme)value).KnownKeys; }
+        }
+
         public override ArcFile TryOpen (ArcView file)
         {
             int ext_count = file.View.ReadInt32 (4);
@@ -65,6 +96,7 @@ namespace GameRes.Formats.AZSys
             var reader = new IndexReader (packed_index, count);
             var index = reader.Unpack();
             int index_offset = 0;
+            bool contains_scripts = false;
             var dir = new List<Entry> (count);
             for (int i = 0; i < count; ++i)
             {
@@ -75,21 +107,27 @@ namespace GameRes.Formats.AZSys
                     entry.Offset = base_offset + LittleEndian.ToUInt32 (index, index_offset);
                     entry.Size = LittleEndian.ToUInt32 (index, index_offset + 4);
                     if (entry.CheckPlacement (file.MaxOffset))
+                    {
                         dir.Add (entry);
+                        contains_scripts = contains_scripts || name.EndsWith (".asb", StringComparison.InvariantCultureIgnoreCase);
+                    }
                 }
                 index_offset += 0x40;
             }
             if (0 == dir.Count)
                 return null;
-            return new ArcFile (file, this, dir);
+            if (!contains_scripts || 0 == KnownKeys.Count)
+                return new ArcFile (file, this, dir);
+            var options = Query<AsbOptions> (arcStrings.ArcEncryptedNotice);
+            if (0 == options.AsbKey)
+                return new ArcFile (file, this, dir);
+            return new AsbArchive (file, this, dir, options.AsbKey);
         }
 
-        static readonly uint[] KnownKeys = new uint[] { 0x1de71cb9 }; // Triptych
-
         public override Stream OpenEntry (ArcFile arc, Entry entry)
         {
-            if (entry.Size < 20
-                || !entry.Name.EndsWith (".asb", StringComparison.InvariantCultureIgnoreCase)
+            var azarc = arc as AsbArchive;
+            if (null == azarc || entry.Size < 20
                 || !arc.File.View.AsciiEqual (entry.Offset, "ASB\x1a"))
                 return arc.File.CreateStream (entry.Offset, entry.Size);
             uint packed   = arc.File.View.ReadUInt32 (entry.Offset+4);
@@ -97,7 +135,7 @@ namespace GameRes.Formats.AZSys
             if (12 + packed != entry.Size)
                 return arc.File.CreateStream (entry.Offset, entry.Size);
 
-            uint key = KnownKeys[0] ^ unpacked;
+            uint key = azarc.Key ^ unpacked;
             key ^= ((key << 12) | key) << 11;
 
             uint first = arc.File.View.ReadUInt16 (entry.Offset+16);
@@ -121,6 +159,24 @@ namespace GameRes.Formats.AZSys
             return new ZLibStream (new MemoryStream (input, 4, input.Length-4), CompressionMode.Decompress);
         }
 
+        public override ResourceOptions GetDefaultOptions ()
+        {
+            return new AsbOptions { AsbKey = GetAsbKey (Settings.Default.AZScriptScheme) };
+        }
+
+        public override object GetAccessWidget ()
+        {
+            return new GUI.WidgetAZ();
+        }
+
+        uint GetAsbKey (string scheme)
+        {
+            uint key;
+            if (KnownKeys.TryGetValue (scheme, out key))
+                return key;
+            return 0;
+        }
+
         internal class IndexReader
         {
             byte[]  m_input;
diff --git a/ArcFormats/AZSys/WidgetAZ.xaml b/ArcFormats/AZSys/WidgetAZ.xaml
new file mode 100644
index 00000000..0d10c1d4
--- /dev/null
+++ b/ArcFormats/AZSys/WidgetAZ.xaml
@@ -0,0 +1,7 @@
+<StackPanel x:Class="GameRes.Formats.GUI.WidgetAZ"
+      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=AZScheme, Mode=TwoWay}"/>
+</StackPanel>
diff --git a/ArcFormats/AZSys/WidgetAZ.xaml.cs b/ArcFormats/AZSys/WidgetAZ.xaml.cs
new file mode 100644
index 00000000..6b908a51
--- /dev/null
+++ b/ArcFormats/AZSys/WidgetAZ.xaml.cs
@@ -0,0 +1,19 @@
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using GameRes.Formats.AZSys;
+
+namespace GameRes.Formats.GUI
+{
+    /// <summary>
+    /// Interaction logic for WidgetAZ.xaml
+    /// </summary>
+    public partial class WidgetAZ : StackPanel
+    {
+        public WidgetAZ()
+        {
+            InitializeComponent();
+            Scheme.ItemsSource = ArcOpener.KnownKeys.Keys.OrderBy (x => x);
+        }
+    }
+}
diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index c2b72d2a..d924c796 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -68,6 +68,9 @@
     <Compile Include="Ankh\ArcGRP.cs" />
     <Compile Include="ArcCG.cs" />
     <Compile Include="ArcZIP.cs" />
+    <Compile Include="AZSys\WidgetAZ.xaml.cs">
+      <DependentUpon>WidgetAZ.xaml</DependentUpon>
+    </Compile>
     <Compile Include="CommonStreams.cs" />
     <Compile Include="Cri\ArcCPK.cs" />
     <Compile Include="Cri\ArcSPC.cs" />
@@ -489,6 +492,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="AZSys\WidgetAZ.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="CatSystem\CreateINTWidget.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
diff --git a/ArcFormats/Properties/Settings.Designer.cs b/ArcFormats/Properties/Settings.Designer.cs
index 2bfbf676..374e085c 100644
--- a/ArcFormats/Properties/Settings.Designer.cs
+++ b/ArcFormats/Properties/Settings.Designer.cs
@@ -501,5 +501,17 @@ namespace GameRes.Formats.Properties {
                 this["ZIPEncodingCP"] = value;
             }
         }
+        
+        [global::System.Configuration.UserScopedSettingAttribute()]
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+        [global::System.Configuration.DefaultSettingValueAttribute("")]
+        public string AZScriptScheme {
+            get {
+                return ((string)(this["AZScriptScheme"]));
+            }
+            set {
+                this["AZScriptScheme"] = value;
+            }
+        }
     }
 }
diff --git a/ArcFormats/Properties/Settings.settings b/ArcFormats/Properties/Settings.settings
index 87049644..a4bf7820 100644
--- a/ArcFormats/Properties/Settings.settings
+++ b/ArcFormats/Properties/Settings.settings
@@ -122,5 +122,8 @@
     <Setting Name="ZIPEncodingCP" Type="System.Int32" Scope="User">
       <Value Profile="(Default)">932</Value>
     </Setting>
+    <Setting Name="AZScriptScheme" Type="System.String" Scope="User">
+      <Value Profile="(Default)" />
+    </Setting>
   </Settings>
 </SettingsFile>
\ No newline at end of file
diff --git a/ArcFormats/app.config b/ArcFormats/app.config
index 5f06f0cb..f3cb6ae3 100644
--- a/ArcFormats/app.config
+++ b/ArcFormats/app.config
@@ -124,6 +124,9 @@
             <setting name="ZIPEncodingCP" serializeAs="String">
                 <value>932</value>
             </setting>
+            <setting name="AZScriptScheme" serializeAs="String">
+                <value />
+            </setting>
         </GameRes.Formats.Properties.Settings>
     </userSettings>
 <startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup></configuration>