Prevent user from including file extension in file name in air application

[Wallan]

So I have an air application that I want to save data from into an custom file. Below is my code. My question is, this code is checking if the user has not typed the ".bar" in their file name, and if they haven't, the program will add it onto the end of the file name.My question is, if a user types "newFile.foo", it saves the file as "newFile.foo.bar". How can I prevent either the user from typing an extension, or maybe have the application remove the ".foo" part, or any other option that will achieve the desired results.Thanks.\[code\]var file:File = File.desktopDirectoryfile.browseForSave("Save");// Create a <projectStrings /> nodevar projectStrings:XML = new XML(<projectStrings />);// Create a <strings /> nodevar strings:XML = new XML(<strings />);strings.@stringOne = "Hello";strings.@stringTwo = "World";// Add the <strings> node to the <projectStrings> node.projectStrings.appendChild(strings);var saveFile:File = File(e.target);var directory:String = saveFile.url;if (directory.indexOf(".ugags") == -1) { trace("WRONG"); directory += ".ugags";}var file:File = new File(directory);var fileStream:FileStream = new FileStream();fileStream.open(file, FileMode.WRITE);fileStream.writeUTFBytes(projectStrings);fileStream.close();\[/code\]