Has anyone built a 64-bit version of PLT Scheme for Windows? I currently use my Linux box when I need a 64-bit app and everything runs fine there. However, I am starting to get other users that would like to run the apps on large data sets under the 64-bit version of Windows. I do have a large memory (8GB) machine running 64-bit Vista that I can use (okay, don't give me too much grief), but I'm not sure how to build a 64-bit PLT Scheme there or if it is even possible. Any ideas? - other than reformatting and loading Linux :) As an aside, how about the same question for OS X (on a x86-64 machine)? Or, is that already a 64-bit app? [My Mac only has 2GB.] Doug W.