diff --git a/OpenRA.Game/FileSystem/BigFile.cs b/OpenRA.Game/FileSystem/BigFile.cs
new file mode 100644
index 0000000000..d4819425e8
--- /dev/null
+++ b/OpenRA.Game/FileSystem/BigFile.cs
@@ -0,0 +1,111 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 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 COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace OpenRA.FileSystem
+{
+	public class BigFile : IFolder
+	{
+		public string Name { get; private set; }
+		public int Priority { get; private set; }
+		readonly Dictionary<string, Entry> entries = new Dictionary<string, Entry>();
+
+		public BigFile(string filename, int priority)
+		{
+			Name = filename;
+			Priority = priority;
+
+			var s = GlobalFileSystem.Open(filename);
+
+			if (s.ReadASCII(4) != "BIGF")
+				throw new InvalidDataException("Header is not BIGF");
+
+			// Total archive size.
+			s.ReadUInt32();
+
+			var entryCount = s.ReadUInt32();
+			if (BitConverter.IsLittleEndian)
+				entryCount = int2.Swap(entryCount);
+
+			// First entry offset? This is apparently bogus for EA's .big files
+			// and we don't have to try seeking there since the entries typically start next in EA's .big files.
+			s.ReadUInt32();
+
+			for (var i = 0; i < entryCount; i++)
+			{
+				var entry = new Entry(s);
+				entries.Add(entry.Path, entry);
+			}
+		}
+
+		class Entry
+		{
+			readonly Stream s;
+			readonly uint offset;
+			readonly uint size;
+			public readonly string Path;
+
+			public Entry(Stream s)
+			{
+				this.s = s;
+
+				offset = s.ReadUInt32();
+				size = s.ReadUInt32();
+				if (BitConverter.IsLittleEndian)
+				{
+					offset = int2.Swap(offset);
+					size = int2.Swap(size);
+				}
+
+				Path = s.ReadASCIIZ();
+			}
+
+			public Stream GetData()
+			{
+				s.Position = offset;
+				return new MemoryStream(s.ReadBytes((int)size));
+			}
+		}
+
+		public Stream GetContent(string filename)
+		{
+			return entries[filename].GetData();
+		}
+
+		public bool Exists(string filename)
+		{
+			return entries.ContainsKey(filename);
+		}
+
+		public IEnumerable<uint> ClassicHashes()
+		{
+			return entries.Keys.Select(filename => PackageEntry.HashFilename(filename, PackageHashType.Classic));
+		}
+
+		public IEnumerable<uint> CrcHashes()
+		{
+			return Enumerable.Empty<uint>();
+		}
+
+		public IEnumerable<string> AllFileNames()
+		{
+			return entries.Keys;
+		}
+
+		public void Write(Dictionary<string, byte[]> contents)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}
\ No newline at end of file
diff --git a/OpenRA.Game/FileSystem/GlobalFileSystem.cs b/OpenRA.Game/FileSystem/GlobalFileSystem.cs
index fd2dbbde6e..38b2030a88 100644
--- a/OpenRA.Game/FileSystem/GlobalFileSystem.cs
+++ b/OpenRA.Game/FileSystem/GlobalFileSystem.cs
@@ -62,40 +62,46 @@ namespace OpenRA.FileSystem
 		{
 			if (filename.EndsWith(".mix", StringComparison.InvariantCultureIgnoreCase))
 				return new MixFile(filename, order, content);
-			else if (filename.EndsWith(".zip", StringComparison.InvariantCultureIgnoreCase))
+			if (filename.EndsWith(".zip", StringComparison.InvariantCultureIgnoreCase))
 				return new ZipFile(filename, order, content);
-			else if (filename.EndsWith(".oramap", StringComparison.InvariantCultureIgnoreCase))
+			if (filename.EndsWith(".oramap", StringComparison.InvariantCultureIgnoreCase))
 				return new ZipFile(filename, order, content);
-			else if (filename.EndsWith(".RS", StringComparison.InvariantCultureIgnoreCase))
-				throw new NotImplementedException("Creating .RS archives is unsupported");
-			else if (filename.EndsWith(".Z", StringComparison.InvariantCultureIgnoreCase))
-				throw new NotImplementedException("Creating .Z archives is unsupported");
-			else if (filename.EndsWith(".PAK", StringComparison.InvariantCultureIgnoreCase))
-				throw new NotImplementedException("Creating .PAK archives is unsupported");
-			else
-				return new Folder(filename, order, content);
+			if (filename.EndsWith(".RS", StringComparison.InvariantCultureIgnoreCase))
+				throw new NotImplementedException("The creation of .RS archives is unimplemented");
+			if (filename.EndsWith(".Z", StringComparison.InvariantCultureIgnoreCase))
+				throw new NotImplementedException("The creation of .Z archives is unimplemented");
+			if (filename.EndsWith(".PAK", StringComparison.InvariantCultureIgnoreCase))
+				throw new NotImplementedException("The creation of .PAK archives is unimplemented");
+			if (filename.EndsWith(".big", StringComparison.InvariantCultureIgnoreCase))
+				throw new NotImplementedException("The creation of .big archives is unimplemented");
+
+			return new Folder(filename, order, content);
 		}
 
 		public static IFolder OpenPackage(string filename, string annotation, int order)
 		{
 			if (filename.EndsWith(".mix", StringComparison.InvariantCultureIgnoreCase))
 			{
-				var type = string.IsNullOrEmpty(annotation) ? PackageHashType.Classic :
-					FieldLoader.GetValue<PackageHashType>("(value)", annotation);
+				var type = string.IsNullOrEmpty(annotation)
+					? PackageHashType.Classic
+					: FieldLoader.GetValue<PackageHashType>("(value)", annotation);
+
 				return new MixFile(filename, type, order);
 			}
-			else if (filename.EndsWith(".zip", StringComparison.InvariantCultureIgnoreCase))
+			if (filename.EndsWith(".zip", StringComparison.InvariantCultureIgnoreCase))
 				return new ZipFile(filename, order);
-			else if (filename.EndsWith(".oramap", StringComparison.InvariantCultureIgnoreCase))
+			if (filename.EndsWith(".oramap", StringComparison.InvariantCultureIgnoreCase))
 				return new ZipFile(filename, order);
-			else if (filename.EndsWith(".RS", StringComparison.InvariantCultureIgnoreCase))
+			if (filename.EndsWith(".RS", StringComparison.InvariantCultureIgnoreCase))
 				return new D2kSoundResources(filename, order);
-			else if (filename.EndsWith(".Z", StringComparison.InvariantCultureIgnoreCase))
+			if (filename.EndsWith(".Z", StringComparison.InvariantCultureIgnoreCase))
 				return new InstallShieldPackage(filename, order);
-			else if (filename.EndsWith(".PAK", StringComparison.InvariantCultureIgnoreCase))
+			if (filename.EndsWith(".PAK", StringComparison.InvariantCultureIgnoreCase))
 				return new PakFile(filename, order);
-			else
-				return new Folder(filename, order);
+			if (filename.EndsWith(".big", StringComparison.InvariantCultureIgnoreCase))
+				return new BigFile(filename, order);
+
+			return new Folder(filename, order);
 		}
 
 		public static void Mount(string name)
diff --git a/OpenRA.Game/OpenRA.Game.csproj b/OpenRA.Game/OpenRA.Game.csproj
index 36eeea7787..c66c36231f 100644
--- a/OpenRA.Game/OpenRA.Game.csproj
+++ b/OpenRA.Game/OpenRA.Game.csproj
@@ -255,6 +255,7 @@
     <Compile Include="FileSystem\MixFile.cs" />
     <Compile Include="FileSystem\Pak.cs" />
     <Compile Include="FileSystem\ZipFile.cs" />
+    <Compile Include="FileSystem\BigFile.cs" />
     <Compile Include="Map\PlayerReference.cs" />
     <Compile Include="Map\SmudgeReference.cs" />
     <Compile Include="Map\TileReference.cs" />