diff --git a/OpenRA.FileFormats/Filesystem/InstallShieldPackage.cs b/OpenRA.FileFormats/Filesystem/InstallShieldPackage.cs
new file mode 100644
index 0000000000..264284ed5f
--- /dev/null
+++ b/OpenRA.FileFormats/Filesystem/InstallShieldPackage.cs
@@ -0,0 +1,120 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see LICENSE.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace OpenRA.FileFormats
+{
+	public class InstallShieldPackage : IFolder
+	{
+		readonly Dictionary<uint, PackageEntry> index;
+		readonly long dataStart;
+		readonly Stream s;
+		int priority;
+
+		public InstallShieldPackage(string filename, int priority)
+		{
+			this.priority = priority;
+			s = FileSystem.Open(filename);
+
+			// Parse package header
+			BinaryReader reader = new BinaryReader(s);
+			uint signature = reader.ReadUInt32();
+			if (signature != 0x8C655D13)
+				throw new InvalidDataException("Not an Installshield package");
+			
+			reader.ReadBytes(8);
+			var FileCount = reader.ReadUInt16();
+			reader.ReadBytes(4);
+			var ArchiveSize = reader.ReadUInt32();
+			reader.ReadBytes(19);
+			var TOCAddress = reader.ReadInt32();
+			
+			Console.WriteLine("SETUP.Z:");
+			Console.WriteLine("FileCount: {0}", FileCount);
+			Console.WriteLine("Archive Size: {0}", ArchiveSize);
+			
+			// Parse the directory list
+			s.Seek(TOCAddress, SeekOrigin.Begin);
+			BinaryReader TOCreader = new BinaryReader(s);
+			while (s.Position < s.Length)
+				ParseDirectory(TOCreader);
+		}
+
+		void ParseDirectory(BinaryReader reader)
+		{
+			// Parse directory header
+			var FileCount = reader.ReadUInt16();
+			var ChunkSize = reader.ReadUInt16();
+			var NameLength = reader.ReadUInt16();
+			var DirName = new String(reader.ReadChars(NameLength));
+			
+			// Skip to the end of the chunk
+			reader.ReadBytes(ChunkSize - NameLength - 6);
+			
+			Console.WriteLine("Directory `{0}': {1}", DirName, FileCount);
+			// Parse files
+			for (var i = 0; i < FileCount; i++)
+				ParseFile(reader);
+		}
+		
+		void ParseFile(BinaryReader reader)
+		{
+			reader.ReadBytes(7);
+			var CompressedSize = reader.ReadUInt32();
+			reader.ReadBytes(12);
+			var ChunkSize = reader.ReadUInt16();
+			reader.ReadBytes(4);
+			var NameLength = reader.ReadByte();
+			var FileName = new String(reader.ReadChars(NameLength));
+
+			// Skip to the end of the chunk
+			reader.ReadBytes(ChunkSize - NameLength - 30);
+			
+			Console.WriteLine("\t{0}: {1}", FileName, CompressedSize);
+		}
+		
+		public Stream GetContent(uint hash)
+		{
+			PackageEntry e;
+			if (!index.TryGetValue(hash, out e))
+				return null;
+
+			s.Seek( dataStart + e.Offset, SeekOrigin.Begin );
+			byte[] data = new byte[ e.Length ];
+			s.Read( data, 0, (int)e.Length );
+			return new MemoryStream(data);
+		}
+
+		public Stream GetContent(string filename)
+		{
+			return GetContent(PackageEntry.HashFilename(filename));
+		}
+
+		public IEnumerable<uint> AllFileHashes()
+		{
+			return index.Keys;
+		}
+		
+		public bool Exists(string filename)
+		{
+			return index.ContainsKey(PackageEntry.HashFilename(filename));
+		}
+
+
+		public int Priority
+		{
+			get { return 1000 + priority; }
+		}
+	}
+}
diff --git a/OpenRA.FileFormats/OpenRA.FileFormats.csproj b/OpenRA.FileFormats/OpenRA.FileFormats.csproj
index f3b11ae7f5..0473182f40 100644
--- a/OpenRA.FileFormats/OpenRA.FileFormats.csproj
+++ b/OpenRA.FileFormats/OpenRA.FileFormats.csproj
@@ -103,6 +103,7 @@
     <Compile Include="Filesystem\Folder.cs" />
     <Compile Include="Filesystem\PackageWriter.cs" />
     <Compile Include="Filesystem\CompressedPackage.cs" />
+    <Compile Include="Filesystem\InstallShieldPackage.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.