如何编译64位版本的我的DLL？

Probably a dumb question: I have a WinXP 32bits desktop that I use to compile a (32 bits) dll with Visual Studio 2005/Intel COmpiler 10.1. I would like to generate a 64 bits version of my dll. How to do that? Answers related to Visual Studio are interesting, but those addressing the Intel compiler side of things get extra brownie points.Probably a dumb question: I have a WinXP 32bits