diff --git a/Legacy/Legacy.csproj b/Legacy/Legacy.csproj
index 2efaa2cc..ab7b2a6f 100644
--- a/Legacy/Legacy.csproj
+++ b/Legacy/Legacy.csproj
@@ -85,6 +85,7 @@
     <Compile Include="Lazycrew\ArcDAT.cs" />
     <Compile Include="Lazycrew\ImageDAT.cs" />
     <Compile Include="Melonpan\ArcTTD.cs" />
+    <Compile Include="Mmfass\ArcSDA.cs" />
     <Compile Include="RSystem\ArcRAD.cs" />
     <Compile Include="RSystem\ImageRSG.cs" />
     <Compile Include="Brownie\ArcNAF.cs" />
diff --git a/Legacy/Mmfass/ArcSDA.cs b/Legacy/Mmfass/ArcSDA.cs
new file mode 100644
index 00000000..8508f092
--- /dev/null
+++ b/Legacy/Mmfass/ArcSDA.cs
@@ -0,0 +1,78 @@
+//! \file       ArcSDA.cs
+//! \date       2018 Oct 08
+//! \brief      MMFass engine 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;
+
+namespace GameRes.Formats.Mmfass
+{
+    [Export(typeof(ArchiveFormat))]
+    public class SdaOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "SDA/MMFASS"; } }
+        public override string Description { get { return "MMFass engine resource archive"; } }
+        public override uint     Signature { get { return 0x4153; } } // 'SA'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public SdaOpener ()
+        {
+            Signatures = new uint[] { 0x30004153, 0x4153, 0 };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (0, "SA"))
+                return null;
+            uint data_offset = file.View.ReadUInt32 (4);
+            if (data_offset <= 8 || data_offset >= file.MaxOffset)
+                return null;
+            int count = (int)(data_offset - 8) / 0x1C;
+            if (!IsSaneCount (count))
+                return null;
+            bool is_graphic = Path.GetFileNameWithoutExtension (file.Name).Equals ("g", StringComparison.OrdinalIgnoreCase);
+            uint index_offset = 8;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                var name = file.View.ReadString (index_offset, 0x14).Trim();
+                if (string.IsNullOrEmpty (name))
+                    return null;
+                var entry = Create<Entry> (name);
+                entry.Offset = file.View.ReadUInt32 (index_offset+0x14) + data_offset;
+                entry.Size   = file.View.ReadUInt32 (index_offset+0x18);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                if (is_graphic)
+                    entry.Type = "image";
+                dir.Add (entry);
+                index_offset += 0x1C;
+            }
+            return new ArcFile (file, this, dir);
+        }
+    }
+}