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Thanks for your reply. So, there is no way, in a sandboxed app, to perform an extension check? It's a pity as it denies to the app the right to prevent a user typo. In this case, no other compatible application will be able to open the file directly, unless the user corrects itself the extension in the Finder… What I don't understand it that this code works in one of my classes… So why are the Sandbox rules considered as violated in a class, and not in another class using the same code?