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The solution is not working on DEV Alpha B device. I cannot list /accounts/1000/appdata/ directory on a DEV Alpha B device. We need a new method to determine whether an app is installed or not.
Nothing has changed since the previous time you asked the question. If you need some API for that, file a Feature Request in JIRA (the issue tracker, link available at the bottom of any developer.blackberry.com page).
