iPhone - Opening files in simulator and device

Hi! I've ported my game to the iPhone and I'm at a point where I can actually play it on the simulator. Nonetheless, when deploying the app into a real device, the game wouldn't work. I ran the app on an iPod touch using the debugger and found out that it's having problems when accessing resource files that are stored inside folders.
I'm attaching a simple project I've made that exemplifies my situation: if I execute it on the simulator I can successfully open the file but, if I execute it on a real device, I get a message that indicates that the file cannot be opened. What am I doing wrong?
Thanks in advance for your help!
--Nacho
I'm attaching a simple project I've made that exemplifies my situation: if I execute it on the simulator I can successfully open the file but, if I execute it on a real device, I get a message that indicates that the file cannot be opened. What am I doing wrong?
Thanks in advance for your help!
--Nacho