I've seen tutorial files that comes with the installation of any SONAR version. The are .CWB and CWP files in a bundle format and they're used as tutorials for mixing, mastering, etc. They come with audio and/or midi files and are intended (I believe) to show how to use SONAR and its tools in these and other situations. In X2 they're located in the "Tutorial Projects" folder which is inside the "Cakewalk Content" folder