So you sandbox all the documents and images and movies and whatnots that come from untrusted sources? Because they all look suspicious? And after testing, how do you know you're infected?
Depends upon source of document; mostly now a days i can throw a document in google drive or a web editor and see it. PDF to HTML works good too; Movies are all from trusted sources streamed via Linux Server... So if its untrusted the clip would most likely loop with a blurred out screen saying i need a codec pack.
I don't do much locally other than write code. I use Web IDE's, Web Editors, Online Markup, Stream via HTML5... Not much to download now-a-days.
