Extract the directory if the registry value points to a filename.

OpenRA.Mods.Common/ModContent.cs

@@ -17,7 +17,7 @@ namespace OpenRA
 {
 	public class ModContent : IGlobalModData
 	{
-		public enum SourceType { Disc, Install }
+		public enum SourceType { Disc, RegistryDirectory, RegistryDirectoryFromFile }
 		public class ModPackage
 		{
 			public readonly string Title;