This means JBoss Developer Studio can run with a 32-bit JVM but servers and other applications can still be launched with 64-bit JVMs from within JBoss Developer Studio. To work around this restriction, you must install a 32-bit version of JBoss Developer Studio with a 32-bit Java Development Kit on 64-bit Mac OS X and Microsoft Windows operating systems. The visual component of the Visual Page Editor, which depends on XULRunner, does not operate in the 64-bit version of JBoss Developer Studio on Mac OS X and Microsoft Windows operating systems.