How to run movies that need webXvid Codec?
You should avoid trying to playback these movies because they're considered as fake. No movie released will ever force you to install a specific codec in order to play it. Most likely you will have to download and install an application that is nowhere near related to the codec's installation. If you need a codec pack, then I recommend you to use Combined Community Codec Pack. It already has all the necessary codecs to play audio and video files.