ADOBE FLEX 3 1123 Adobe Flex 3 Developer Guide Using resource modules Resource modules are SWF files, separate from your application SWF, that contain resources bundles for a single locale. Your application can preload one or more resource modules as it starts up, before it displays its user interface. It can also load resource modules later, such as in response to the user selecting a new locale. The ResourceManager interacts with all resource bundles the same, whether the bundles it manages were originally compiled into the application or loaded from resource modules. Resource modules can be a better approach to localization than compile-time resources because you externalize the resource modules that can be loaded at run time. This creates a smaller application SWF file, but then requires that you load a separate SWF file for each resource module that you use. The result can be an increased number of network requests and an aggregate application size that is larger than if you compiled the locale resources into the application. However, if you have many locales, then loading them separately should save resources in the long run. You are limited as to when you can use resources in resource modules during the application initialization sequence. The earliest that you can access a resource bundle in a resource module is during the application's prein-