diff --git a/OpenRa.FileFormats/Package.cs b/OpenRa.FileFormats/Package.cs
index cda9f79e20..3c86266141 100644
--- a/OpenRa.FileFormats/Package.cs
+++ b/OpenRa.FileFormats/Package.cs
@@ -38,9 +38,10 @@ namespace OpenRa.FileFormats
 					return;
 				}
 			}
+			else
+				s.Seek( 0, SeekOrigin.Begin );
 
 			isEncrypted = false;
-			s.Seek(0, SeekOrigin.Begin);
 			index = ParseTdHeader(s, out dataStart).ToDictionary(x => x.Hash);
 		}
 
diff --git a/OpenRa.Game/MainWindow.cs b/OpenRa.Game/MainWindow.cs
index e0b2702bf5..957eccef2d 100755
--- a/OpenRa.Game/MainWindow.cs
+++ b/OpenRa.Game/MainWindow.cs
@@ -26,7 +26,9 @@ namespace OpenRa.Game
 
 		public MainWindow(Settings settings)
 		{
-			FileSystem.Mount(new Folder("../../../../"));
+			FileSystem.Mount( new Folder( "../../../../" ) );
+			if( File.Exists( "../../../../main.mix" ) )
+				FileSystem.Mount(new Package("main.mix"));
 			FileSystem.Mount(new Package("redalert.mix"));
 			FileSystem.Mount(new Package("conquer.mix"));
 			FileSystem.Mount(new Package("hires.mix"));