I've seen very few conclusive threads regarding this issue. I have several video files that play fine in WMP but encounter a codec problem in Media Center. I have read that Media Center will default to certain codecs that may conflict with installed codecs, but haven't really heard of a good solution for resolving this. I've seen a third party plugin that is supposed to address the issue, but I do not know if it is a trusted source and I'm trying to keep my HTPC as clean as possible. Any advice would be most helpful. Thanks in advance!