Hi, this is my first post. I come here a lot to just read up on things and find solutions to some problems I have every once in a while. Now, I have a problem that I can't find the solution to, so here goes. And hopefully this is the most appropriate forum to post on... I have a video file in .mkv format that will not play unless I specifically select to use Chinese audio, embedded in the file. I've used MPC and WMP. Here are the details of the streams that MPC are reporting through the Properties panel: Video: MPEG4 Video (H264) 1440x796 (480:199) 23.98fps [Video] Audio: Dolby AC3 48000Hz 6ch [Audio] The two audio streams are called: DDPlus5.1 640Kbps [English] DD5.1 384Kbps [Chinese] And again, I must select Chinese in order for the video to play. I have AC3 Filter installed. I'm using CoreAVC for the video. My computer specs are: 1.6Ghz Intel 1GB Memory ATI X1300 Mobility Radeon Is this enough information to get some input regarding what's going on? How do I get the video to play using English language? Thank you.