--- masterfs/src/org/netbeans/modules/masterfs/ProvidedExtensionsProxy.java	
+++ masterfs/src/org/netbeans/modules/masterfs/ProvidedExtensionsProxy.java	
@@ -222,7 +222,10 @@ 
                     }
                 });                                                                                
             }
+            if(ret[0] != null && ret[0]) {
+                break;
         }
+        }
         return ret[0] != null ? ret[0] : super.canWrite(f);
     }