What's the Worst File Type in Terms Usefulness > File Size Ratio?

The answer is : Powerpoint.

In a presentation, the PowerPoint files are kept in the presenter's computer, and he or she plugs it to a projector to present his points while the computer goes to sleep halfway or goes into screensaver and bores everyone to death. That is fine. Because you can leave the room.

BUT, somehow people thought that PowerPoint might also be perfectly good tool for file sharing, or to type out jokes in them to share for some reason, so they put a perfect piece of 40kb sized high quality Jpeg photograph into a lousy PowerPoint slide which inflates that size into a 5.5 mb file and also drops the photo quality so it renders the photo useless. And once you start downloading that email you can't stop it. Some people compile that into a .exe, so only Windows users can use it, or they get tagged as potentially harmful downloads.

People are saying the newer versions don't take up much space, but I don't care. For the love of Santa Claus, just stop using PowerPoint, PLEASE!