From the forums topic: Howto prefer 32 Bit JVM?
Quoting tboerkel: "I installed 64 Bit JVM first and then 32 Bit JVM. When I double-click a JAR, then it will use the 32 Bit JVM. But when I start via the .exe, it uses the 64 Bit JVM. How can I force launch4j to use the latest installed JVM or the 32 Bit JVM (no hardcoding of paths)? "
Selecting 32 bit JVM or 64 bit JVM as required or optional would be a great new Feature / Option