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("."); 
		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
Adds default extension to the filename