By default, all software supports multiple file extensions. X3D supports at least 2 different file extensions. The basic files that X3D supports are .UVR. However, not all of the extensions listed on the list are always used to save the effects of work in X3D. Very often, files with such extensions are used as source data files used by X3D.
X3D 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 X3D and try to save it in another file format, also supported by X3D.