*.fdd files (Form Definition Files).
Form samples are binary files with the extension *.dtf. Page samples are saved in *.ptf format, which is a modified version of *.fdd format.Save forms in ABBYY FormDesigner as *.fdd Form Definition Files, and save form samples as *.dtf or page samples as *.ptf with the Save As command.
*.fdd files (Form Definition Files).
Form samples are binary files with the extension *.dtf. Page samples are saved in *.ptf format, which is a modified version of *.fdd format.