deployed platform app has 2 exe files

When I create a NetBeans Platform app and deploy it, it has 2 executables in the bin subdirectory....for example myapp.exe and myapp64.exe. myapp64.exe is always larger than myapp.exe. It doesn't matter if I am putting the app on a 32 or 64 bit platform either so that doesn't seem to have anything to do with it. 

It also doesn't matter which one I click on to execute the platform application.

Can anyone tell me the difference and why there are always 2 different ones?

thanks