Fix #3156

src/Loading/babylon.sceneLoader.ts

@@ -125,15 +125,15 @@
                 sceneFilename = sceneFilename.name;
             }
 
-            var dotPosition = sceneFilename.lastIndexOf(".");
-
             var queryStringPosition = sceneFilename.indexOf("?");
-
-            if (queryStringPosition === -1) {
-                queryStringPosition = sceneFilename.length;
+            
+            if (queryStringPosition !== -1) {
+                sceneFilename = sceneFilename.substring(0, queryStringPosition);
             }
 
-            var extension = sceneFilename.substring(dotPosition, queryStringPosition).toLowerCase();
+            var dotPosition = sceneFilename.lastIndexOf(".");
+
+            var extension = sceneFilename.substring(dotPosition, sceneFilename.length).toLowerCase();
             return SceneLoader._getPluginForExtension(extension);
         }