I found a fix for the .avi bug that once in a while will give a 'file being used by another person or program' error message when you try to rename, delete or move an .avi file (usually large and/or corrupted and/or indexless avi files). I did not create this fix and I don’t know the people who made it. It's a very useful fix and I think a lot of people would like to have it. The source code comes with it in the .zip file. Enjoy!