By default, all software supports multiple file extensions. MU Online supports at least 4 different file extensions. The basic files that MU Online supports are .BMD. However, not all of the extensions listed on the list are always used to save the effects of work in MU Online. Very often, files with such extensions are used as source data files used by MU Online.
MU Online 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 MU Online and try to save it in another file format, also supported by MU Online.