diff --git a/Legacy/Yaneurao/ArcSDA.cs b/Legacy/Yaneurao/ArcSDA.cs
new file mode 100644
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+++ b/Legacy/Yaneurao/ArcSDA.cs
@@ -0,0 +1,87 @@
+//! \file       ArcSDA.cs
+//! \date       2018 Jun 06
+//! \brief      YaneSDK2 resource archive.
+//
+// Copyright (C) 2018 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 GameRes.Compression;
+
+// [040716][Squadra D] Auction
+
+namespace GameRes.Formats.Yaneurao
+{
+    [Export(typeof(ArchiveFormat))]
+    public class SdaOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "SDA/yane"; } }
+        public override string Description { get { return "YaneSDK2 resource archive"; } }
+        public override uint     Signature { get { return 0x41445153; } } // 'SQDARC'
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (0, "SQDARC"))
+                return null;
+            int dir_count = file.View.ReadInt32 (0x10);
+            if (!IsSaneCount (dir_count))
+                return null;
+            var dir = new List<Entry>();
+            uint index_offset = 0x14;
+            for (int i = 0; i < dir_count; ++i)
+            {
+                uint dir_offset = file.View.ReadUInt32 (index_offset);
+                int file_count = file.View.ReadInt32 (index_offset+4);
+                var dir_name = file.View.ReadString (index_offset+8, 10);
+                var ext = file.View.ReadString (index_offset+0x12, 4);
+                for (int j = 0; j < file_count; ++j)
+                {
+                    var name = file.View.ReadString (dir_offset, 0x28);
+                    name = Path.Combine (dir_name, name);
+                    name = Path.ChangeExtension (name, ext);
+                    var entry = FormatCatalog.Instance.Create<Entry> (name);
+                    entry.Offset = file.View.ReadUInt32 (dir_offset+0x28);
+                    entry.Size   = file.View.ReadUInt32 (dir_offset+0x2C);
+                    dir_offset += 0x30;
+                    dir.Add (entry);
+                }
+                index_offset += 0x18;
+            }
+            if (0 == dir.Count)
+                return null;
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked)
+                return input;
+            return new LzssStream (input);
+        }
+    }
+}