.NUD File Extension

Calendar created by Now Up-To-Date, an application that organizes calendar activities; contains events separated into day, week, month, and year views; includes event information such as the title, date, time, priority, and type.

To create the NUD file, select File → Save or Save As..., name the file, choose the save location, and click Save.

To import an .ICS file, select File → Import iCalendar File..., select the ICS file, and click Open.