Starting with CR 2008, the Crystal Reports sample data was changed from an MDB to several XML files. Fortunately, the Xtreme MDB was still available for download, along with the associated sample reports. I linked to this download from my blog and website so that students with newer version of CR could still do the lessons in my course materials. That link worked for about 10 years.
Today I learned that this link has finally died. I will try to find another link to download the file. Until I find one the link will point to a copy on my own site.