If your application is designed to support more than one national language, you select the language file you want to use by registering your application's .mpr file. You register an .mpr file in a class script named loaded that goes in your application class. The script is as follows:
loaded self abtRegisterExternalStrings.
loaded reads abtExternalizedStringBuildingInfo for the MPR file name and registers the .mpr file when your application loads into an image.