Date: 2013may7 OS: Windows Q. How can a 64bit program use a 32bit DLL? A. It can not be done directly. But 64bit programs can launch 32bit programs and that makes some things possible. You can use rundll32.exe if the functions in the DLL are written a certain way. http://www.google.com/search?q=Q164787 You can write a 32bit program yourself as a intermediary.