What is our biggest fear when we double-click an icon, when our system opens an external file? Being hacked! You know it, because this is what the medias would make their headlines about. Crashing an app or your system is also a risk, but it’s not that scary in comparison. And besides… What else could happen? it’s fine… It’s fine, because we always have the sweet illusion that by reading the specs of its file format, we’d get a clear understanding of what that file is supposed to do. As if… ;) Can we still trust file formats? On top of that, while preservationists want to store reliably information for ever, infosec people are ready to ban a file format if it doesn’t match security standards… Can we trust their future?