By default, all software supports multiple file extensions. Mass Mailing News supports at least 1 different file extensions. The basic files that Mass Mailing News supports are .ECL. However, not all of the extensions listed on the list are always used to save the effects of work in Mass Mailing News. Very often, files with such extensions are used as source data files used by Mass Mailing News.
Mass Mailing News can be used to convert file formats between the file extensions listed below. You can open a file with one of the file extensions below via Mass Mailing News and try to save it in another file format, also supported by Mass Mailing News.