I have a ton of digital video on my computer. Even though it was all recorded at about the same time and on the same camera some will play and some will not. It is a quick time file but when I click on it, it says that quicktime does not support this file. If I click on another video that is in the same format, recorded by the same camera, at about the same time, it will play just fine. I had no problem playing any of these files a few weeks ago. I have reinstalled quicktime and the problem is still there. Please let me know how I can get my computer to play my files.