I have his buddy with a video for the school cut. All video files that we have used are on an external hard drive saved. Since my PC external hard drive as drive O is displayed and at my buddy as drive E, but we varied s.beiden computers have worked, was always the message: "When you open this file, an error occurred." This message came, because the path of the videos in the new video are included, with me under O /.... and found him under E /.... . This is quite normal and we could solve it initially synonymous. But today I wanted to re-edit the video and wanted to change the path. It came on the following problem: There are suddenly no *. wmv files anymore. But only *. avi, *. mpg, etc. but no *. wmv. How come? I hope you understand my problem and can send me as soon as possible to help. Is really important.