This is an Aperture Project containing a series of Versions with different adjustments applied, for use as image presets via the Lift-n-Stamp tool. If you downloaded the first version of this Project from February 2008, this version has several new presets and also includes the Master file, making it easier to add your own presets.
Note that all thumbnails have been removed to reduce the file size, they will automatically be regenerated after you've imported the Project into Aperture.