do not add extension for file name

editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/projects/CreateFileWizardPage.java

 /*
  * Copyright (c) 2012, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 24 matching lines @@
 public class CreateFileWizardPage extends WizardNewFileCreationPage {
 
   public CreateFileWizardPage(String pageName, IStructuredSelection selection) {
     super(pageName, selection);
   }
 
   @Override
   public IFile createNewFile() {
 
     String fileName = getFileName().trim();
-    if (fileName.indexOf(".") == -1) { //$NON-NLS-1$
+    if (fileName.indexOf(".") == -1 && !fileName.equals("BUILD")) { //$NON-NLS-1$
       setFileName(fileName + ".dart"); //$NON-NLS-1$
     }
 
     return super.createNewFile();
   }
 
   @Override
   protected void createAdvancedControls(Composite parent) {
     //no-op to ensure we don't get silly resource linking options
   }
@@ skipping 38 matching lines @@
         && (StringUtilities.containsUpperCase(fileName) || StringUtilities.containsWhitespace(fileName))) {
       setMessage(
           ProjectMessages.CreateFileWizardPage_filename_content_warning_label,
           IMessageProvider.WARNING);
     }
 
     return true;
   }
 
 }