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In the iMovie HD era, your movie may appear on the hard drive in one of two formats.
If it's a new iMovie HD project, it's represented on your hard drive by a single file icon (see Figure 13-6, top). Having a single-icon project document makes it very convenient to open, copy, delete, rename, or move a video project, because you have only one icon to worry about.
If it's an older iMovie project that you've opened into iMovie HD, it remains just as it was: as a folder full of associated files (Figure 13-6, bottom).