Thank you for the advice, I have looked into it and found out the following.
1. If I right click on the .app file (which is created using flash) and choose to show package content they are booth the same size, about 11.98 MB, but if I right click on the .app file without opening the package content one is 10.01 something and the other is 11.98.
2. Both have identical read / write permissions
3. I use Adobe Flash CS5.5 to create the installer
I use the include files box in the Adobe AIR settings to choose the files to go in the installer. I also add a .swf and a .xml file which are all working fine.
Thanks for investigating
Would it be possible to send me your native installer along with a zip copy of the .app file so I can take a look? I'm not sure why you see a size change when navigating into the package, must be something going on at the OS level there.
Additionally, have you tried running under ADL to see if you're app is throwing an exception?