By default, all software supports multiple file extensions. RRD4J supports at least 1 different file extensions. The basic files that RRD4J supports are .RRD4J. However, not all of the extensions listed on the list are always used to save the effects of work in RRD4J. Very often, files with such extensions are used as source data files used by RRD4J.
RRD4J 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 RRD4J and try to save it in another file format, also supported by RRD4J.