A while ago I edited a video for a client. Everything went well until the project was actually, well... done. I edited in iMovie, converted the clip to MPEG-4 and burned it to DVD with free software called Burn. The disc played just fine for me on a couple different machines, but he could never get it to play in Windows Media Player. I told him to install codecs; still nothing. So instead I burned the DVD again, this time in iDVD. So I'm guessing this time the video format was in MPEG-2. Again, the DVD played perfectly fine when I tested it on two different machines. The client tries to play the DVD in Windows Media Player. Still nothing... I've told him to download VLC, but he's arguing the fact that this disc should work on pre-installed software on every PC (in this case, Windows Media Player). I do agree with him on that, but let's face it, Windows Media Player is not the best software to use. So my question: What is the best way to go about this? I've tried using Burn and iDVD with no luck (on his end). Any help is much appreciated!