The exe wrapper you are using for the windows build does not recognize 64 bit JVM's and pops an error message on startup.
"No JVM could be found on your system. Please define EXE4J_JAVA_HOME to point to an installed 32-bit JDK or JRE or download a JRE from www.java.com"
I'm not a fan of having a 32 bit JVM lying around just for this app (it's bound to cause JVM conflicts sooner or later) so I'm using AudioGalazy in the mean time.
Running the standalone build (war file) does work as an alternative solution, but has it's downsides as well.
If you add the x64 support I'd be glad to come back over.