.ics

Universal calendar format used by Apple iCal, Mozilla Sunbird, and Google Calendar; allows users to publish and share calendar data on the Web; other users can subscribe to published calendars and imports events into their own calendars.

Three-dimensional model or scene created with IronCAD, a 3D CAD program; may contain one or more 3D objects with colors, textures, lighting effects, and animation data.

Important: ICS files may automatically open in a calendar program such as MS Outlook due to the iCalendar file association. To open ICS files in IronCAD, you may need to right-click the file, select "Open With..." and choose IronCAD as the program.