Bug 134740 [Wizards] PDE product wizard is not obvious to use.
see attached image. The wizard for creating a new product opens with a file name initialized to ".product" which is selected. Generally this would imply that this is a good default but if you start typing you will replace the text with something else that is also a good name. If you require an extension for a file you should add it yourself like the "Export Archive" wizard.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardNewFileCreationPage.java
* </p>
	 * <p>
	 * This method should be called within a workspace modify operation since it
	 * creates resources.
	 * </p>
	 * 
	 * @return the created file resource, or <code>null</code> if the file was
	 *         not created
	 */
	public IFile createNewFile() {
		if (newFile != null) {
			return newFile;
		}
		
		final IPath containerPath = resourceGroup.getContainerFullPath();
		IPath newFilePath = containerPath.append(resourceGroup.getResource());
		final IFile newFileHandle = createFileHandle(newFilePath);
		final InputStream initialContents = getInitialContents();
		createLinkTarget();
		IRunnableWithProgress op = new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) {
				CreateFileOperation op = new CreateFileOperation(newFileHandle,
						linkTargetPath, initialContents,
						IDEWorkbenchMessages.WizardNewFileCreationPage_title);
				try {
					PlatformUI.getWorkbench().getOperationSupport()
							.getOperationHistory().execute(
									op,
									monitor,
									WorkspaceUndoUtil