Open the app and tap the Downloads option to view downloaded files on your phone or tablet. If you don't like the default file manager app. Answer on https://groups.google.com/forum/#!topic/microsoft.public.powerpoint/vsH6MTjZusk. Click File, Click options, Click Trust Centre, Click Trust Center. Your situation isn't your own fault; the other person needs to send the file in the proper format. Second thing to note: Some files aren't worth opening. Don't even try.
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