G'day All Just wondering what happens when you run an A3X on a 64 bit system. I've checked through the registry and any A3X is run by the following command. "C:Program Files (x86)AutoIt3AutoIt3.exe" "%1" %* or "C:\Program Files (x86)\AutoIt3\Beta\AutoIt3.exe" "%1" %* I know that scripts run differently on 64 and 32 bit systems. SO... IF I compile a script for 64Bit but choose A3X output does it run as a 64Bit or 32Bit application? Thanks for the info! John