Ok some annoying behaviour here. I'm getting the spinning beachball whenever i select an .ac3 file in columns view with the preview option on. It goes on forever while trying to generate a preview for the .ac3 file, which it can't because an .ac3 file needs to be decoded to play, it won't even just show the file icon and be done with it, so i end up having to relaunch the finder. It dosn't happen with the preview option in finder disabled but i like my previews and want them there. The default 'open with' application for .ac3 files on my system is dvd studio pro and i cant change this because everytime i go to 'get info' the finder tries to generate a preview and the ball starts up again. Anybody got any tips for a workaround on this, i'm working on a project at the minute and have all my previews switched off which is a bit of a nuisance. If anyone could give me a workaround for switching off preview for only particular file extensions that would be great.