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