Announcing Windows API Audio/Video Player
AVPlayer.rbp is the source code for a Windows API AVPlayer. It will Play various types of Audio and Video files (essentially the same that the Windows Media Player will play).
Note: although rather barebones, this program does allow you to set the position in the file or set the volume of the sound.
Caution: The slider is not handled in the traditional way (I forget why at the moment). If you click anyplace on the slider bar, the slider will go immediately to that position.
For video, you can make the playback full-screen only by pulling (dragging) the borders of the window.
You can download the file here.