32-bit JNI to 64-bit JNI in Windows

I have a JNI connection in a Windows/JBOSS environment that connects to a 32-bit DLL. Now I have received a 64-bit version of the DLL and am expected to make it work with  our 64-bit solution.

I have a thin 32-bit dll-layer of my own code that I need to get working with the 64-bit dll, so I assume I need to configure the MS VIsual Studio 2005 somehow. Also, my development computer is 32-bit XP.

1. What do I need to do (code-wise, compiling wise and other)?

Will it work with the things I have or do I need something newer?

Are there any apperant pitfalls?