Autoit is famous for FPs...I use it myself, and have to take steps to avoid flagging of my programs. Some best practices: don't use FileInstall() or UPX, don't pack binaries inside your files (e.g. packing them in file resources as RCDATA), and build apps using 3.3.8.0 or older if you can (I and many others been having major issues with newer versions falsing)