I usually just use Windows Media player, though I've tried Zune and VLC to play back video files (mp4, avi). However, most video files do not fully maximize to the screen – rather, it is a slightly smaller rectangle with some black space around it.
Why is this?
Aren't there any video player applications for Windows that allow for true "full screen"? Maybe I'm missing a setting somewhere in one of the apps I've tried?