It must be something I've done - I'm sure, but WMP has just stopped playing back DivX content saying 'Format not supported'. It has ALWAYS worked for DivX 3,4 or 5 content, has only just stopped working completely. Nothing works! The DivX player Alpha still plays everything successfully - no problems there. I've tried downloading the avi fix .reg files (both of them). Tried one, then the other. Still nothing. It's as if Windows XP is simply not finding the right playback filter any more, no matter what I do. I've uninstalled and re-installed the codecs. Still nothing. Is there any way to fix this? Is there a way for me to see what video codecs are installed in Windows XP? I have a feeling it's choosing the wrong filter maybe? And maybe the priority of that filter sits above the correct ones? I've never had this before in all the time I've played with divx (pretty much since the beginning), and although I'm usually quite clever at solving these things, I really am at a complete loss on this one. Any ideas? TIA. Ramrunner