You can configure BlueZone FTP to automatically choose the correct transfer mode by selecting the Auto transfer mode. When Auto is selected, you must set the default transfer mode (Binary or ASCII), then if required, create a list of file extensions that are exceptions to the default transfer mode.
For example, if the majority of the files you transfer are program files and other non text-based files, set the default transfer mode to Binary, then add any exceptions like HTML files and TXT files to the Exceptions List located on the Auto Mode tab.