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.