By default, all software supports multiple file extensions. Unity supports at least 10 different file extensions. The basic files that Unity supports are .UNITY3D. However, not all of the extensions listed on the list are always used to save the effects of work in Unity. Very often, files with such extensions are used as source data files used by Unity.
Unity 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 Unity and try to save it in another file format, also supported by Unity.