I'm pretty sure they are.
Here's what's odd...before I started messing around with Construct, I downloaded the stand-alone "demo" of Ghost Shooter and it worked fine. Afterward, I downloaded the tutorial for the game and loaded the .cap. When I try and run it, however, I get an error saying:
"Errors occurred compiling one of the FX files in your Effects directory. The application will run with effects disabled. You need to fix the FX script, or stop using it, before effects can run correctly in this application."
I found a post on this here - http://www.scirra.com/phpBB3/viewtopic.php?f=3&t=2536&p=19398 which seems quite similar to my situation, but I don't know exactly what he did to fix it.