action automatic for that user. Selecting "Prompt me each time to choose an action" deletes any association; AutoPlay will prompt the next time. The content types available vary with the type of drive selected. Pictures, Music files and Video files are available with any drive. DVD and CD drives can also have "Music CD" or "DVD movie" and Windows Vista adds others like "Video CD movie" to the list. Mixed content "Mixed content" is the result of file content types falling into more than one of the Pictures, Music files or Video files content types. Note that a CD containing audio tracks is always considered to be a "Music CD" by Windows, regardless of the presence of data tracks. Therefore, a CD with Picture files, Video files and audio tracks is a "Music CD"; it is not "Mixed content". If this is the result of the AutoPlay decision, the user is always presented with the AutoPlay dialog. This will contain a selection of applications deemed appropriate for the content found. Thus if Music files and Video files are both discovered on a flash drive, the user will get to choose from the Handlers for "Music files" along with the Handlers for "Video files". In this case, the user cannot make their selection the default one. However, the AutoPlay properties dialog for any drive usually gives "Mixed content" as a content type option. The options available here are limited to actions that can handle any type of files, usually "Open folder to view files" is the only Handler listed here. This enables the user to make that action the default for Mixed content. Non-volume devices Certain types of devices do not appear as drive letters in "My Computer". These are called non-volume devices and AutoPlay handles them somewhat differently from volume devices like CDs and DVDs. Many digital cameras and video devices fall into this category. As Windows cannot examine the files on the device to determine content type, it is left to the manufacturer to decide how to proceed. A manufacturer can register Handlers against their particular device, can add their device to a group of devices (e.g.: ZipDrives) or allow a device class (e.g.: all devices which are Video Cameras) to handle their device for them. This determines which Handlers will be listed in the AutoPlay dialog when their device is discovered. As these type of devices do not