Remove unused leftover oramod loading code.

OpenRA.Game/FileSystem/Folder.cs

@@ -51,6 +51,22 @@ namespace OpenRA.FileSystem
 			return combined.StartsWith(path, StringComparison.Ordinal) && File.Exists(combined);
 		}
 
+		public IReadOnlyPackage OpenPackage(string filename, FileSystem context)
+		{
+			var subFolder = Platform.ResolvePath(Path.Combine(Name, filename));
+			if (Directory.Exists(subFolder))
+				return new Folder(subFolder);
+
+			// Other package types can be loaded normally
+			IReadOnlyPackage package;
+			var s = GetStream(filename);
+			if (context.TryParsePackage(s, filename, out package))
+				return package;
+
+			s.Dispose();
+			return null;
+		}
+		
 		public void Update(string filename, byte[] contents)
 		{
 			// HACK: ZipFiles can't be loaded as read-write from a stream, so we are

OpenRA.Game/InstalledMods.cs

@@ -68,21 +68,10 @@ namespace OpenRA
 			IReadOnlyPackage package = null;
 			try
 			{
-				if (Directory.Exists(path))
+				if (!Directory.Exists(path))
-					package = new Folder(path);
+					throw new InvalidDataException(path + " is not a valid mod package");
-				else
-				{
-					try
-					{
-						using (var fileStream = File.OpenRead(path))
-							package = new ZipFile(fileStream, path);
-					}
-					catch
-					{
-						throw new InvalidDataException(path + " is not a valid mod package");
-					}
-				}
 
+				package = new Folder(path);
 				if (!package.Contains("mod.yaml"))
 					throw new InvalidDataException(path + " is not a valid mod package");