Thanks. Turns out the ptw2_utf8.rc file was on the external BIAB hard drive, but for some reason I had not copied it over to my computer's hard drive, which is where I usually run the application from. This fixed my problem.
Just want to say the Audio Chord Wizard is a great application. I've used it on a few jazz fusion tunes with weird chord changes with great results.
MacBook Pro 17"
2.5 GHz Intel Core i7
Mac OS X 10.8.3