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    $\begingroup$ You can't use free CDF to open files. mathematica.stackexchange.com/questions/8929/… if that is what you are trying to do. You'd need the pro CDF for that. $\endgroup$ Commented Dec 26, 2013 at 7:45
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    $\begingroup$ I don't know much about what is OK on the free CDFPlayer, but maybe FileNames[{"*.nb"} is disallowed because it looks as if you were fishing for what files are available. Try Button["open", Print @ RandomChoice[FileNames[{"*.nb"}, {NotebookDirectory[ButtonNotebook[]]}]]]. It might give you more insight. $\endgroup$ Commented Dec 26, 2013 at 8:31
  • $\begingroup$ Thanks for those comments, and that information. It makes sense that CDFPlayer would not be able to "fish" for file names and open one. I'd still like to find a solution that would choose a question at random, but I can simply link to the files. So my question is answered…. $\endgroup$ Commented Dec 26, 2013 at 9:29