Hi, im having the same problem? Well i think so anyway, see the thing is im only a teenager and i know nothing about computers! Haha. But anyway, i have Sony Vegas Pro 10, and i cannot open .avi videos! 🙁 I can see that you have found a solution to this? But i dont get your explanation at all, (sorry, its not your fault its mine, im not good with computers as i said) but you said to change the file name? Change the file name on what? If you could help i would really appreciate it. Thank-you. 🙂 x