support for the interior tileSet. trees don't work. mounted all 3 of the tileSet mixen; this means there are name-clashes in some cases.

OpenRa.Game/Game.cs

@@ -46,7 +46,6 @@ namespace OpenRa
 			Game.changePending = false;
 			Game.mapName = mapName;
 			SheetBuilder.Initialize(renderer);
-			SpriteSheetBuilder.Initialize();
 			FileSystem.UnmountTemporaryPackages();
 			Timer.Time( "reset: {0}" );
 
@@ -71,8 +70,8 @@ namespace OpenRa
 			Timer.Time( "SeqProv, viewport: {0}" );
 
 			skipMakeAnims = true;
-			foreach (var treeReference in Game.world.Map.Trees)
-				world.CreateActor(treeReference.Image, new int2(treeReference.Location), null);
+			//foreach (var treeReference in Game.world.Map.Trees)
+			//	world.CreateActor(treeReference.Image, new int2(treeReference.Location), null);
 			Timer.Time( "trees: {0}" );
 			
 			world.LoadMapActors(Rules.AllRules);

OpenRa.Game/Graphics/SpriteSheetBuilder.cs

@@ -6,13 +6,19 @@ namespace OpenRa.Graphics
 {
 	static class SpriteSheetBuilder
 	{
-		public static void Initialize()
+		public static void Initialize( Map map )
 		{
+			exts = new[] {
+				"." + map.Theater.Substring( 0, 3 ).ToLowerInvariant(),
+				".shp",
+				".tem",
+				".sno",
+				".int" };
 			sprites = new Cache<string, Sprite[]>( LoadSprites );
 		}
 
 		static Cache<string, Sprite[]> sprites;
-		static readonly string[] exts = { ".tem", ".sno", ".int", ".shp" };
+		static string[] exts;
 
 		static Sprite[] LoadSprites(string filename)
 		{

OpenRa.Game/World.cs

@@ -56,9 +56,8 @@ namespace OpenRa
 
 			Map = new Map( Rules.AllRules );
 			Timer.Time( "new Map: {0}" );
-			FileSystem.MountTemporary( new Package( Map.Theater + ".mix" ) );
-			Timer.Time( "mount temporary packages: {0}" );
 			TileSet = new TileSet( Map.TileSuffix );
+			SpriteSheetBuilder.Initialize( Map );
 			Timer.Time( "Tileset: {0}" );
 
 			BuildingInfluence = new BuildingInfluenceMap( this );