Dunno if this is what you need but after a trawl found it on bootdisk.com
My Computer, right click the drive, Properties, Autoplay page. Select the type of disk (eg Music CD,Blank CD, mixed content, etc) and set what you want to do. For 'Mixed content' you should normally have 'open with explorer' so that AutoRun of CDs will work.
Thank goodness for goooogle
