diff --git a/OpenRA.FileFormats/CompressedPackage.cs b/OpenRA.FileFormats/CompressedPackage.cs
index 4b9f553b6b..fa04960878 100644
--- a/OpenRA.FileFormats/CompressedPackage.cs
+++ b/OpenRA.FileFormats/CompressedPackage.cs
@@ -41,5 +41,11 @@ namespace OpenRA.FileFormats
 		{
 			return hashes.Contains(PackageEntry.HashFilename(filename));
 		}
+
+
+		public int Priority
+		{
+			get { return 1; }
+		}
 	}
 }
diff --git a/OpenRA.FileFormats/FileSystem.cs b/OpenRA.FileFormats/FileSystem.cs
index cd59b5eee0..5ab7e8d5f6 100644
--- a/OpenRA.FileFormats/FileSystem.cs
+++ b/OpenRA.FileFormats/FileSystem.cs
@@ -12,6 +12,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Reflection;
+using System.Linq;
 
 namespace OpenRA.FileFormats
 {
@@ -73,9 +74,14 @@ namespace OpenRA.FileFormats
 
 		static Stream GetFromCache( Cache<uint, List<IFolder>> index, string filename )
 		{
-			foreach( var folder in index[ PackageEntry.HashFilename( filename ) ] )
-				if (folder.Exists(filename))
-					return folder.GetContent(filename);
+			var folder = index[PackageEntry.HashFilename(filename)]
+				.Where(x => x.Exists(filename))
+				.OrderByDescending(x => x.Priority)
+				.FirstOrDefault();
+
+			if (folder != null)
+				return folder.GetContent(filename);
+
 			return null;
 		}
 
@@ -88,11 +94,13 @@ namespace OpenRA.FileFormats
 					return ret;
 			}
 
-			foreach( IFolder folder in mountedFolders )
-			{
-				if (folder.Exists(filename))
-					return folder.GetContent(filename);
-			}
+			var folder = mountedFolders
+				.Where(x => x.Exists(filename))
+				.OrderByDescending(x => x.Priority)
+				.FirstOrDefault();
+
+			if (folder != null)
+				return folder.GetContent(filename);
 
 			throw new FileNotFoundException( string.Format( "File not found: {0}", filename ), filename );
 		}
diff --git a/OpenRA.FileFormats/Folder.cs b/OpenRA.FileFormats/Folder.cs
index f76d41fa27..9666d86808 100644
--- a/OpenRA.FileFormats/Folder.cs
+++ b/OpenRA.FileFormats/Folder.cs
@@ -28,12 +28,18 @@ namespace OpenRA.FileFormats
 		public IEnumerable<uint> AllFileHashes()
 		{
 			foreach( var filename in Directory.GetFiles( path, "*", SearchOption.TopDirectoryOnly ) )
-				yield return PackageEntry.HashFilename( filename );
+				yield return PackageEntry.HashFilename( Path.GetFileName(filename) );
 		}
 		
 		public bool Exists(string filename)
 		{
 			return File.Exists(Path.Combine(path,filename));
 		}
+
+
+		public int Priority
+		{
+			get { return 100; }
+		}
 	}
 }
diff --git a/OpenRA.FileFormats/Package.cs b/OpenRA.FileFormats/Package.cs
index 0d847890a3..3ff551d4b3 100644
--- a/OpenRA.FileFormats/Package.cs
+++ b/OpenRA.FileFormats/Package.cs
@@ -20,6 +20,7 @@ namespace OpenRA.FileFormats
 		Stream GetContent(string filename);
 		bool Exists(string filename);
 		IEnumerable<uint> AllFileHashes();
+		int Priority { get; }
 	}
 
 	public class Package : IFolder
@@ -149,6 +150,12 @@ namespace OpenRA.FileFormats
 		{
 			return index.ContainsKey(PackageEntry.HashFilename(filename));
 		}
+
+
+		public int Priority
+		{
+			get { return 0; }
+		}
 	}
 
 	[Flags]