By default, all software supports multiple file extensions. FRED2 supports at least 1 different file extensions. The basic files that FRED2 supports are .FS2. However, not all of the extensions listed on the list are always used to save the effects of work in FRED2. Very often, files with such extensions are used as source data files used by FRED2.
FRED2 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 FRED2 and try to save it in another file format, also supported by FRED2.