diff --git a/OpenRA.Game/FileSystem/GlobalFileSystem.cs b/OpenRA.Game/FileSystem/GlobalFileSystem.cs
index 89813d345f..255e7e1bb3 100644
--- a/OpenRA.Game/FileSystem/GlobalFileSystem.cs
+++ b/OpenRA.Game/FileSystem/GlobalFileSystem.cs
@@ -17,18 +17,6 @@ using OpenRA.Primitives;
 
 namespace OpenRA.FileSystem
 {
-	public interface IFolder : IDisposable
-	{
-		Stream GetContent(string filename);
-		bool Exists(string filename);
-		IEnumerable<uint> ClassicHashes();
-		IEnumerable<uint> CrcHashes();
-		IEnumerable<string> AllFileNames();
-		void Write(Dictionary<string, byte[]> contents);
-		int Priority { get; }
-		string Name { get; }
-	}
-
 	public static class GlobalFileSystem
 	{
 		public static List<IFolder> MountedFolders = new List<IFolder>();
diff --git a/OpenRA.Game/FileSystem/IFolder.cs b/OpenRA.Game/FileSystem/IFolder.cs
new file mode 100644
index 0000000000..fa5aa4df87
--- /dev/null
+++ b/OpenRA.Game/FileSystem/IFolder.cs
@@ -0,0 +1,28 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 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;
+
+namespace OpenRA.FileSystem
+{
+	public interface IFolder : IDisposable
+	{
+		Stream GetContent(string filename);
+		bool Exists(string filename);
+		IEnumerable<uint> ClassicHashes();
+		IEnumerable<uint> CrcHashes();
+		IEnumerable<string> AllFileNames();
+		void Write(Dictionary<string, byte[]> contents);
+		int Priority { get; }
+		string Name { get; }
+	}
+}