some time we need to figure out if any resoures files are already packed in the app. we can find it from mac under the path as below, in this case the app name is 3dhw:
/Users/dingqun2008/Library/Developer/Xcode/DerivedData/3dhw-dychilwmyhglaeaalsypvckomsud/Build/Products/Debug-iphoneos/3dhw.app/3dhw
basically, you can go to ~/Developer/Xcode/DerivedData/ to find yours.