When you run this search, the expected results are live web server directories. A classic example is the official Corel legacy FTP archive, hosted on public mirrors. A typical landing page for such a directory looks like this:

While the intitle:index of technique is a fascinating way to explore the structure of the web, its use comes with serious implications.

So the full query is searching for open web directories that host CorelDRAW files related to lifestyle and entertainment design themes.