I've added the package latex2rtf-win64-gui. It works for Win NT, 2000, XP, 2003, and Vista, also on 64bit versions. It contains the latex2rtf program plus a Graphical User Interface (GUI) and an automatic installer.
The difference to the latex2rtf-win-gui package is that latex2rtf-win-gui contains some helper programs which are 16bit programs and thus will not run under 64bit versions of Windows.
The package latex2rtf-win64-gui contains only Win32 programs which will also run under Win64 but maybe slower than the 16bit versions under Win32 systems.