I'm writing an app that uses a proprietary file extension. The app will successfully open when a file with that extension is double-clicked in finder, but what I would like is for the app to open automatically when a file that the proper extension is downloaded via safari. Can anyone shed some light on how to do this? MUST I much around with the DownloadAssessment.plist file, or is there a simpler way for me to do this within my xcode project? Thank you very much indeed -- my client really wants this functionality.