I wish I could tell you. My Windows Mediaviewer automatically downloaded the codec. The avi2mpg conversion was done using avi2mpeg by Darim Vision Co., Ltd. I set it to convert to Mpeg2ProgramStream in the advanced DVMPEG Properties(the only setting that would properly convert -- ) The playback was on the MSmedia & it automatically downloaded. The MSmedia View/Options/Advanced shows it's set for Streaming Media from RealVideo. I hope that helps you read it. {aren't non-standard "Standards" wonderful?;/}