The AppleScript is an Apple Automation tool that only runs on MAC OS, and is used for automating processes and tasks. I don't have any experience with it, but it seems that it was used to build some sort of web browser simulator.
Please remember that the Agile Platform a agile web development framework, and it doesn't have any tool for building automated web browser navigation.
However, it's important to clarify what are you trying to accomplish here: what process/task are you trying to replace or integrate the AppleScript with the Agile Platform?
Can you describe in a clear manner the overall architecture of that process/task using Apple Script and FileMaker, and what part are you trying to integrate with the Agile Platform?
Miguel Simões João