diff --git a/Legacy/Alterna/ArcBIN.cs b/Legacy/Alterna/ArcBIN.cs
new file mode 100644
index 00000000..6cbaba6c
--- /dev/null
+++ b/Legacy/Alterna/ArcBIN.cs
@@ -0,0 +1,106 @@
+//! \file       ArcBIN.cs
+//! \date       2019 Mar 21
+//! \brief      Alterna resource archive.
+//
+// Copyright (C) 2019 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;
+using GameRes.Utility;
+
+// [051028][ALTERNA] ShiroKuro ~Shiroi Kokoro to Kuroi Tsurugi~
+
+namespace GameRes.Formats.Alterna
+{
+    [Export(typeof(ArchiveFormat))]
+    public class BinOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "BIN/ARC1"; } }
+        public override string Description { get { return "Alterna resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public BinOpener ()
+        {
+            ContainedFormats = new[] { "BMP", "OGG", "SCR" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (file.Name.HasExtension (".lst"))
+                return null;
+            var lst_name = Path.ChangeExtension (file.Name, ".lst");
+            if (!VFS.FileExists (lst_name))
+                return null;
+            using (var lst = VFS.OpenView (lst_name))
+            {
+                if (!lst.View.AsciiEqual (0, "ARC1.00"))
+                    return null;
+                int count = lst.View.ReadInt32 (8);
+                if (!IsSaneCount (count))
+                    return null;
+                uint lst_pos = 0x10;
+                var name_buffer = new byte[0x20];
+                var dir = new List<Entry> (count);
+                for (int i = 0; i < count; ++i)
+                {
+                    lst.View.Read (lst_pos+0x10, name_buffer, 0, 0x20);
+                    for (int j = 0; j < 0x20 && name_buffer[j] != 0; ++j)
+                    {
+                        name_buffer[j] ^= 0x80;
+                    }
+                    var name = Binary.GetCString (name_buffer, 0);
+                    var entry = Create<PackedEntry> (name);
+                    entry.Size   = lst.View.ReadUInt32 (lst_pos + 8);
+                    entry.Offset = lst.View.ReadUInt32 (lst_pos + 0xC);
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    entry.UnpackedSize = lst.View.ReadUInt32 (lst_pos + 4);
+                    entry.IsPacked = lst.View.ReadInt32 (lst_pos) != 0;
+                    dir.Add (entry);
+                    lst_pos += 0x30;
+                }
+                return new ArcFile (file, this, dir);
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked || !arc.File.View.AsciiEqual (entry.Offset, "LZSS"))
+                return base.OpenEntry (arc, entry);
+            var input = arc.File.CreateStream (entry.Offset+8, entry.Size-8);
+            var lzss = new LzssStream (input);
+            lzss.Config.FrameInitPos = 0xFF0;
+            return lzss;
+        }
+    }
+
+    [Export(typeof(ResourceAlias))]
+    [ExportMetadata("Extension", "STR")]
+    [ExportMetadata("Target", "SCR")]
+    public class StrFormat : ResourceAlias { }
+}