Avi files have a bug in XP. XP thinks that it has to read through every avi
file every time that you open a folder that contains any. You also get the
locked file in use when trying to delete, rename, move, etc. avi files.
The only down side to the above fix is that when you right click an avi file
and select Properties, the Summary page will be blank or grayed out. Which
I decided was a lesser evil than some of the other problems .avi files
cause.