Are your wiki tutorials supposed to accompany example files? If so, where could I find them?
There’s plenty of particle systems for you to fiddle with in the Effects Sample Content Map
Find a particle system you want to modify
then migrate it into your own project
Click on the PS and select Migrate
select content folder of your project
Now you can follow along with the tutorial!
What Rama is saying to do is a good idea for getting your content together. The tutorial in question is an intermediate level particle tutorial and expects you to provide your own assets. I hope this clarifies the issue.
Thank you for your answers!