By default, all software supports multiple file extensions. FB2 Reader supports at least 1 different file extensions. The basic files that FB2 Reader supports are .TXT. However, not all of the extensions listed on the list are always used to save the effects of work in FB2 Reader. Very often, files with such extensions are used as source data files used by FB2 Reader.
FB2 Reader 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 FB2 Reader and try to save it in another file format, also supported by FB2 Reader.