Forcing java 32 bit execution

Is there a definitive way to determine all the JVMs (both 64 bit and 32 bit) installed on a system (windows) programatically? I know i can do it from java control panel but I am more looking how to find it from a script.
I have a 32 bit application for which I am trying to write an installer for. I want to install 32 bit java if it's not already installed and also force 32 bit java to launch my application if both 64 bit and 32 bit are installed. On Macs I know that there is a -d32 options, is there something similar on windows.
Somehow the whole 64 bit and 32 bit java execution is very confusing :(

I apologize if I hurt anyone's feelings. I didnt mean to get into an argument at all. I take back my statements and I am still looking for an answer to my question.
I made some progress though, to detect 64-bit and 32-bit versions of java on a windows box -
64-Bit JVMs: List reg keys HKLM/Software/JavaSoft/Java Runtime Environment
32-Bit JVMs: List reg keys HKLM/Software/Wow6432node/JavaSoft/Java Runtime Environment
Now, coming to why is it important: Without getting into the real importance of JNI for a process intensive application, let's just say I am bound to use some third-party API which have 32 bit native libraries (I can't compile them now into 64 bit and neither do I want to maintain two sets of dlls). Now, this application can't be run on a 64 bit java VM. This is where it gets into a confusing design, I don't have to run a special version of windows / linux to run a 32 bit application - 64 bit versions can handle the 32 bit applications in their own "compatibility mode". So I don't understand why can't a 64 bit java have a compatibility mode to load up 32 bit native libraries. Again, I dont want to start a debate here -- I am looking for answers.

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