Note that it is not possible to create launchers that work with both 64-bit and 32-bit JREs. Since the launcher starts the JVM with the JNI interface by loading the JVM DLL, the architecture has to be the same. If you target both 32-bit and 64-bit JREs and operating systems, you have to generate different media files for them.
On a 64-bit Windows, there are separate system directories for 32-bit and 64-bit applications. If
you enable the 64-bit executable mode in this step, those system directories will be appropriate for
64-bit applications, e.g. c:\Program Files
instead of c:\Program Files (x86)
.