Still on 32-bit. We tried in on 64 bit, but ....problems. Filemaker is still an 32 bit application and will only run on 64-bit machines in a 32-bit compatibility mode. Because it is a 32-bit application, it will not take advantage of 64-bit benefits, hence we pushed it back to 32. To answer your question James, in dual.... Yes it runs on 64 bit but in 32 bit compatibility.....