Every once in awhile I'll come back to RCT3 with an obscure scenario goal.

This time around I was going to play with creating my own custom fireworks (and display).

BUT, my question: if I build an advanced firework for a scenario does that firework become part of the scenario or do I need to create a second file that has to be downloaded separately?

If the firework explains the scenario then it seems rather important that they stay together.

Ok, FYI for the next person with the same question...

It appears that fireworks are imported into the park you are creating.  Thus, you can build advanced fireworks and will not need to create a separate file (like one must do with custom scenery).

Anything you create, such as custom fireworks, within a park will be saved with that park, just like coasters. There is the option to save custom fireworks as a separate file when you make them, then you can import them to other parks.