New 64-bit Windows build

If you're on Windows, you share a lot of files (or browse a lot of shares) and the client often crashes for you, there's a good chance it's just running out of memory. Thanks to forum user David H. for persevering through weeks of trying out different builds and sending dozens of crash reports until we finally figured out it was all just a memory problem. Bear in mind that even though the 64-bit build can use as much memory as it needs, it *will* use more memory. There are a lot of pointers flying around, and those are now all double the size. If you run into any problems with the new build, please post about it here.

Thanks, Nir