diff --git a/OpenRA.Mods.Common/FileFormats/InstallShieldCABCompression.cs b/OpenRA.Mods.Common/FileFormats/InstallShieldCABCompression.cs
new file mode 100644
index 0000000000..53b970a483
--- /dev/null
+++ b/OpenRA.Mods.Common/FileFormats/InstallShieldCABCompression.cs
@@ -0,0 +1,438 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.RegularExpressions;
+using ICSharpCode.SharpZipLib.Zip.Compression;
+
+namespace OpenRA.Mods.Common.FileFormats
+{
+	public sealed class InstallShieldCABCompression
+	{
+		const uint MaxFileGroupCount = 71;
+
+		enum CABFlags : ushort
+		{
+			FileSplit = 0x1,
+			FileObfuscated = 0x2,
+			FileCompressed = 0x4,
+			FileInvalid = 0x8,
+		}
+
+		enum LinkFlags : byte
+		{
+			Prev = 0x1,
+			Next = 0x2
+		}
+
+		struct FileGroup
+		{
+			public readonly string Name;
+			public readonly uint FirstFile;
+			public readonly uint LastFile;
+
+			public FileGroup(Stream stream, long offset)
+			{
+				var nameOffset = stream.ReadUInt32();
+				stream.Position += 18;
+				FirstFile = stream.ReadUInt32();
+				LastFile = stream.ReadUInt32();
+
+				var pos = stream.Position;
+				stream.Position = offset + nameOffset;
+				Name = stream.ReadASCIIZ();
+				stream.Position = pos;
+			}
+		}
+
+		struct CabDescriptor
+		{
+			public readonly long FileTableOffset;
+			public readonly uint FileTableSize;
+			public readonly uint FileTableSize2;
+			public readonly uint DirectoryCount;
+
+			public readonly uint FileCount;
+			public readonly long FileTableOffset2;
+
+			public CabDescriptor(Stream stream)
+			{
+				FileTableOffset = stream.ReadUInt32();
+				stream.Position += 4;
+				FileTableSize = stream.ReadUInt32();
+				FileTableSize2 = stream.ReadUInt32();
+				DirectoryCount = stream.ReadUInt32();
+				stream.Position += 8;
+				FileCount = stream.ReadUInt32();
+				FileTableOffset2 = stream.ReadUInt32();
+			}
+		}
+
+		struct DirectoryDescriptor
+		{
+			public readonly string Name;
+
+			public DirectoryDescriptor(Stream stream, long nameTableOffset)
+			{
+				var nameOffset = stream.ReadUInt32();
+				var pos = stream.Position;
+
+				stream.Position = nameTableOffset + nameOffset;
+
+				Name = stream.ReadASCIIZ();
+				stream.Position = pos;
+			}
+		}
+
+		struct FileDescriptor
+		{
+			public readonly uint Index;
+			public readonly CABFlags Flags;
+			public readonly uint ExpandedSize;
+			public readonly uint CompressedSize;
+			public readonly uint DataOffset;
+
+			public readonly byte[] MD5;
+			public readonly uint NameOffset;
+			public readonly ushort DirectoryIndex;
+			public readonly uint LinkToPrevious;
+
+			public readonly uint LinkToNext;
+			public readonly LinkFlags LinkFlags;
+			public readonly ushort Volume;
+			public readonly string Filename;
+
+			public FileDescriptor(Stream stream, uint index, long tableOffset)
+			{
+				Index = index;
+				Flags = (CABFlags)stream.ReadUInt16();
+				ExpandedSize = stream.ReadUInt32();
+				stream.Position += 4;
+				CompressedSize = stream.ReadUInt32();
+
+				stream.Position += 4;
+				DataOffset = stream.ReadUInt32();
+				stream.Position += 4;
+				MD5 = stream.ReadBytes(16);
+
+				stream.Position += 16;
+				NameOffset = stream.ReadUInt32();
+				DirectoryIndex = stream.ReadUInt16();
+				stream.Position += 12;
+				LinkToPrevious = stream.ReadUInt32();
+				LinkToNext = stream.ReadUInt32();
+
+				LinkFlags = (LinkFlags)stream.ReadUInt8();
+				Volume = stream.ReadUInt16();
+
+				var pos = stream.Position;
+				stream.Position = tableOffset + NameOffset;
+				Filename = stream.ReadASCIIZ();
+				stream.Position = pos;
+			}
+		}
+
+		struct CommonHeader
+		{
+			public const long Size = 16;
+			public readonly uint Version;
+			public readonly uint VolumeInfo;
+			public readonly long CabDescriptorOffset;
+			public readonly uint CabDescriptorSize;
+
+			public CommonHeader(Stream stream)
+			{
+				Version = stream.ReadUInt32();
+				VolumeInfo = stream.ReadUInt32();
+				CabDescriptorOffset = stream.ReadUInt32();
+				CabDescriptorSize = stream.ReadUInt32();
+			}
+		}
+
+		struct VolumeHeader
+		{
+			public readonly uint DataOffset;
+			public readonly uint DataOffsetHigh;
+			public readonly uint FirstFileIndex;
+			public readonly uint LastFileIndex;
+
+			public readonly uint FirstFileOffset;
+			public readonly uint FirstFileOffsetHigh;
+			public readonly uint FirstFileSizeExpanded;
+			public readonly uint FirstFileSizeExpandedHigh;
+
+			public readonly uint FirstFileSizeCompressed;
+			public readonly uint FirstFileSizeCompressedHigh;
+			public readonly uint LastFileOffset;
+			public readonly uint LastFileOffsetHigh;
+
+			public readonly uint LastFileSizeExpanded;
+			public readonly uint LastFileSizeExpandedHigh;
+			public readonly uint LastFileSizeCompressed;
+			public readonly uint LastFileSizeCompressedHigh;
+
+			public VolumeHeader(Stream stream)
+			{
+				DataOffset = stream.ReadUInt32();
+				DataOffsetHigh = stream.ReadUInt32();
+
+				FirstFileIndex = stream.ReadUInt32();
+				LastFileIndex = stream.ReadUInt32();
+				FirstFileOffset = stream.ReadUInt32();
+				FirstFileOffsetHigh = stream.ReadUInt32();
+
+				FirstFileSizeExpanded = stream.ReadUInt32();
+				FirstFileSizeExpandedHigh = stream.ReadUInt32();
+				FirstFileSizeCompressed = stream.ReadUInt32();
+				FirstFileSizeCompressedHigh = stream.ReadUInt32();
+
+				LastFileOffset = stream.ReadUInt32();
+				LastFileOffsetHigh = stream.ReadUInt32();
+				LastFileSizeExpanded = stream.ReadUInt32();
+				LastFileSizeExpandedHigh = stream.ReadUInt32();
+
+				LastFileSizeCompressed = stream.ReadUInt32();
+				LastFileSizeCompressedHigh = stream.ReadUInt32();
+			}
+		}
+
+		class CabExtracter
+		{
+			readonly FileDescriptor file;
+			readonly Dictionary<int, Stream> volumes;
+
+			uint remainingInArchive;
+			uint toExtract;
+
+			int currentVolumeID;
+			Stream currentVolume;
+
+			public CabExtracter(FileDescriptor file, Dictionary<int, Stream> volumes)
+			{
+				this.file = file;
+				this.volumes = volumes;
+
+				remainingInArchive = 0;
+				toExtract = file.Flags.HasFlag(CABFlags.FileCompressed) ? file.CompressedSize : file.ExpandedSize;
+
+				SetVolume(file.Volume);
+			}
+
+			public void CopyTo(Stream output, Action<int> onProgress)
+			{
+				if (file.Flags.HasFlag(CABFlags.FileCompressed))
+				{
+					var inf = new Inflater(true);
+					var buffer = new byte[165535];
+					do
+					{
+						var bytesToExtract = currentVolume.ReadUInt16();
+						remainingInArchive -= 2;
+						toExtract -= 2;
+						inf.SetInput(GetBytes(bytesToExtract));
+						toExtract -= bytesToExtract;
+						while (!inf.IsNeedingInput)
+						{
+							if (onProgress != null)
+								onProgress((int)(100 * output.Position / file.ExpandedSize));
+
+							var inflated = inf.Inflate(buffer);
+							output.Write(buffer, 0, inflated);
+						}
+
+						inf.Reset();
+					} while (toExtract > 0);
+				}
+				else
+				{
+					do
+					{
+						if (onProgress != null)
+							onProgress((int)(100 * output.Position / file.ExpandedSize));
+
+						toExtract -= remainingInArchive;
+						output.Write(GetBytes(remainingInArchive), 0, (int)remainingInArchive);
+					} while (toExtract > 0);
+				}
+			}
+
+			public byte[] GetBytes(uint count)
+			{
+				if (count < remainingInArchive)
+				{
+					remainingInArchive -= count;
+					return currentVolume.ReadBytes((int)count);
+				}
+				else
+				{
+					var outArray = new byte[count];
+					var read = currentVolume.Read(outArray, 0, (int)remainingInArchive);
+					if (toExtract > remainingInArchive)
+					{
+						SetVolume(currentVolumeID + 1);
+						remainingInArchive -= (uint)currentVolume.Read(outArray, read, (int)count - read);
+					}
+
+					return outArray;
+				}
+			}
+
+			void SetVolume(int newVolume)
+			{
+				currentVolumeID = newVolume;
+				if (!volumes.TryGetValue(currentVolumeID, out currentVolume))
+					throw new FileNotFoundException("Volume {0} is not available".F(currentVolumeID));
+
+				currentVolume.Position = 0;
+				if (currentVolume.ReadUInt32() != 0x28635349)
+					throw new InvalidDataException("Not an Installshield CAB package");
+
+				uint fileOffset;
+				if (file.Flags.HasFlag(CABFlags.FileSplit))
+				{
+					currentVolume.Position += CommonHeader.Size;
+					var head = new VolumeHeader(currentVolume);
+					if (file.Index == head.LastFileIndex)
+					{
+						if (file.Flags.HasFlag(CABFlags.FileCompressed))
+							remainingInArchive = head.LastFileSizeCompressed;
+						else
+							remainingInArchive = head.LastFileSizeExpanded;
+
+						fileOffset = head.LastFileOffset;
+					}
+					else if (file.Index == head.FirstFileIndex)
+					{
+						if (file.Flags.HasFlag(CABFlags.FileCompressed))
+							remainingInArchive = head.FirstFileSizeCompressed;
+						else
+							remainingInArchive = head.FirstFileSizeExpanded;
+
+						fileOffset = head.FirstFileOffset;
+					}
+					else
+						throw new Exception("Cannot Resolve Remaining Stream");
+				}
+				else
+				{
+					if (file.Flags.HasFlag(CABFlags.FileCompressed))
+						remainingInArchive = file.CompressedSize;
+					else
+						remainingInArchive = file.ExpandedSize;
+
+					fileOffset = file.DataOffset;
+				}
+
+				currentVolume.Position = fileOffset;
+			}
+		}
+
+		readonly Dictionary<string, FileDescriptor> index = new Dictionary<string, FileDescriptor>();
+		readonly Dictionary<int, Stream> volumes;
+
+		public InstallShieldCABCompression(Stream header, Dictionary<int, Stream> volumes)
+		{
+			this.volumes = volumes;
+
+			if (header.ReadUInt32() != 0x28635349)
+				throw new InvalidDataException("Not an Installshield CAB package");
+
+			header.Position += 8;
+			var cabDescriptorOffset = header.ReadUInt32();
+			header.Position = cabDescriptorOffset + 12;
+			var cabDescriptor = new CabDescriptor(header);
+			header.Position += 14;
+
+			var fileGroupOffsets = new uint[MaxFileGroupCount];
+			for (var i = 0; i < MaxFileGroupCount; i++)
+				fileGroupOffsets[i] = header.ReadUInt32();
+
+			header.Position = cabDescriptorOffset + cabDescriptor.FileTableOffset;
+			var directories = new DirectoryDescriptor[cabDescriptor.DirectoryCount];
+			for (var i = 0; i < directories.Length; i++)
+				directories[i] = new DirectoryDescriptor(header, cabDescriptorOffset + cabDescriptor.FileTableOffset);
+
+			var fileGroups = new List<FileGroup>();
+			foreach (var offset in fileGroupOffsets)
+			{
+				var nextOffset = offset;
+				while (nextOffset != 0)
+				{
+					header.Position = cabDescriptorOffset + (long)nextOffset + 4;
+					var descriptorOffset = header.ReadUInt32();
+					nextOffset = header.ReadUInt32();
+					header.Position = cabDescriptorOffset + descriptorOffset;
+
+					fileGroups.Add(new FileGroup(header, cabDescriptorOffset));
+				}
+			}
+
+			header.Position = cabDescriptorOffset + cabDescriptor.FileTableOffset + cabDescriptor.FileTableOffset2;
+			foreach (var fileGroup in fileGroups)
+			{
+				for (var i = fileGroup.FirstFile; i <= fileGroup.LastFile; i++)
+				{
+					header.Position = cabDescriptorOffset +	cabDescriptor.FileTableOffset + cabDescriptor.FileTableOffset2 + i * 0x57;
+					var file = new FileDescriptor(header, i, cabDescriptorOffset + cabDescriptor.FileTableOffset);
+					var path = "{0}\\{1}\\{2}".F(fileGroup.Name, directories[file.DirectoryIndex].Name, file.Filename);
+					index[path] = file;
+				}
+			}
+		}
+
+		public void ExtractFile(string filename, Stream output, Action<int> onProgress = null)
+		{
+			FileDescriptor file;
+			if (!index.TryGetValue(filename, out file))
+				throw new FileNotFoundException(filename);
+
+			ExtractFile(file, output, onProgress);
+		}
+
+		void ExtractFile(FileDescriptor file, Stream output, Action<int> onProgress = null)
+		{
+			if (file.Flags.HasFlag(CABFlags.FileInvalid))
+				throw new Exception("File Invalid");
+
+			if (file.LinkFlags.HasFlag(LinkFlags.Prev))
+			{
+				var prev = index.Values.First(f => f.Index == file.LinkToPrevious);
+				ExtractFile(prev, output, onProgress);
+				return;
+			}
+
+			if (file.Flags.HasFlag(CABFlags.FileObfuscated))
+				throw new NotImplementedException("Obfuscated files are not supported");
+
+			var extracter = new CabExtracter(file, volumes);
+			extracter.CopyTo(output, onProgress);
+
+			if (output.Length != file.ExpandedSize)
+				throw new InvalidDataException("File expanded to wrong length. Expected = {0}, Got = {1}".F(file.ExpandedSize, output.Length));
+		}
+
+		public IReadOnlyDictionary<int, IEnumerable<string>> Contents
+		{
+			get
+			{
+				var contents = new Dictionary<int, List<string>>();
+				foreach (var kv in index)
+					contents.GetOrAdd(kv.Value.Volume).Add(kv.Key);
+
+				return new ReadOnlyDictionary<int, IEnumerable<string>>(contents
+					.ToDictionary(x => x.Key, x => x.Value.AsEnumerable()));
+			}
+		}
+	}
+}
diff --git a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
index aa47b17679..44c49a43f9 100644
--- a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
+++ b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
@@ -775,6 +775,8 @@
     <Compile Include="Traits\ExitsDebugOverlay.cs" />
     <Compile Include="Traits\World\ExitsDebugOverlayManager.cs" />
     <Compile Include="Activities\Air\FlyCircleTimed.cs" />
+    <Compile Include="UtilityCommands\ListInstallShieldCabContentsCommand.cs" />
+    <Compile Include="FileFormats\InstallShieldCABCompression.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
diff --git a/OpenRA.Mods.Common/UtilityCommands/ListInstallShieldCabContentsCommand.cs b/OpenRA.Mods.Common/UtilityCommands/ListInstallShieldCabContentsCommand.cs
new file mode 100644
index 0000000000..04e9610e50
--- /dev/null
+++ b/OpenRA.Mods.Common/UtilityCommands/ListInstallShieldCabContentsCommand.cs
@@ -0,0 +1,41 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using OpenRA.Mods.Common.FileFormats;
+
+namespace OpenRA.Mods.Common.UtilityCommands
+{
+	class ListInstallShieldCabContentsCommand : IUtilityCommand
+	{
+		public string Name { get { return "--list-installshield-cab"; } }
+
+		public bool ValidateArguments(string[] args)
+		{
+			return args.Length == 2;
+		}
+
+		[Desc("DATA.HDR", "Lists the filenames contained within an Installshield CAB volume set")]
+		public void Run(ModData modData, string[] args)
+		{
+			var package = new InstallShieldCABCompression(File.OpenRead(args[1]), null);
+			foreach (var volume in package.Contents.OrderBy(kv => kv.Key))
+			{
+				Console.WriteLine("Volume: {0}", volume.Key);
+				foreach (var filename in volume.Value)
+					Console.WriteLine("\t{0}", filename);
+			}
+		}
+	}
+}
diff --git a/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromDiscLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromDiscLogic.cs
index 8583959e37..5fabfccd88 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromDiscLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/Installation/InstallFromDiscLogic.cs
@@ -234,6 +234,12 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 								break;
 							}
 
+							case "extract-iscab":
+							{
+								ExtractFromISCab(path, i.Value, extracted, m => message = m);
+								break;
+							}
+
 							default:
 								Log.Write("debug", "Unknown installation command {0} - ignoring", i.Key);
 								break;
@@ -370,6 +376,59 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			}
 		}
 
+		static void ExtractFromISCab(string path, MiniYaml actionYaml, List<string> extractedFiles, Action<string> updateMessage)
+		{
+			var sourcePath = Path.Combine(path, actionYaml.Value);
+			var volumeNode = actionYaml.Nodes.FirstOrDefault(n => n.Key == "Volumes");
+			if (volumeNode == null)
+				throw new InvalidDataException("extract-iscab entry doesn't define a Volumes node");
+
+			var extractNode = actionYaml.Nodes.FirstOrDefault(n => n.Key == "Extract");
+			if (extractNode == null)
+				throw new InvalidDataException("extract-iscab entry doesn't define an Extract node");
+
+			var volumes = new Dictionary<int, Stream>();
+			try
+			{
+				foreach (var node in volumeNode.Value.Nodes)
+				{
+					var volume = FieldLoader.GetValue<int>("(key)", node.Key);
+					var stream = File.OpenRead(Path.Combine(path, node.Value.Value));
+					volumes.Add(volume, stream);
+				}
+
+				using (var source = File.OpenRead(sourcePath))
+				{
+					var reader = new InstallShieldCABCompression(source, volumes);
+					foreach (var node in extractNode.Value.Nodes)
+					{
+						var targetPath = Platform.ResolvePath(node.Key);
+
+						if (File.Exists(targetPath))
+						{
+							Log.Write("install", "Skipping installed file " + targetPath);
+							continue;
+						}
+
+						extractedFiles.Add(targetPath);
+						Directory.CreateDirectory(Path.GetDirectoryName(targetPath));
+						using (var target = File.OpenWrite(targetPath))
+						{
+							Log.Write("install", "Extracting {0} -> {1}".F(sourcePath, targetPath));
+							var displayFilename = Path.GetFileName(Path.GetFileName(targetPath));
+							Action<int> onProgress = percent => updateMessage("Extracting {0} ({1}%)".F(displayFilename, percent));
+							reader.ExtractFile(node.Value.Value, target, onProgress);
+						}
+					}
+				}
+			}
+			finally
+			{
+				foreach (var kv in volumes)
+					kv.Value.Dispose();
+			}
+		}
+
 		string FindSourcePath(ModContent.ModSource source, IEnumerable<string> volumes)
 		{
 			if (source.Type == ModContent.SourceType.Install)