By default, all software supports multiple file extensions. Google Calendar supports at least 3 different file extensions. The basic files that Google Calendar supports are .ICS. However, not all of the extensions listed on the list are always used to save the effects of work in Google Calendar. Very often, files with such extensions are used as source data files used by Google Calendar.
Google Calendar 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 Google Calendar and try to save it in another file format, also supported by Google Calendar.