org.glassmaker.eclipse/org.glassmaker.ui.editor/src/main/java/org/glassmaker/ui/editor/wizards/NewCardFileWizardPage.java
String addDefaultExtension(String filename) {
		StringBuffer newFileName = new StringBuffer(filename);

		String ext = "card";

		newFileName.append("."); //$NON-NLS-1$
		newFileName.append(ext);

		return newFileName.toString();
	}
String addDefaultExtension(String filename) {
		StringBuffer newFileName = new StringBuffer(filename);

		String ext = "card";

		newFileName.append("."); //$NON-NLS-1$
		newFileName.append(ext);

		return newFileName.toString();
	}
Adds default extension to the filename

@param filename
@return