With extension spoofer you can hide your virus in any .***, but they need to have exe/jar at the end of the file name, example omgnicemoviexe.mp4 this can be a virus. But you will notice as you don't get a movie just a error massage when running. There are ways to "melt" the virus into movies and still get the movie to work, as far as I know the file need to be .exe for that but they might have found a work around for that. Only download for trusted up loaders, eztv etc..