Programs enabling conversion of the file:
If your objective is to convert the file from MP3 to the file FLA, you can use any of the applications listed. MP3 to FLA conversion process in every program intended for this purpose (so-called converters) is very intuitive and everyone is able to manage converting a file.
However, bear in mind that the list may also include programs to support and work with the indicated extensions MP3 and FLA - and not only converters. In such a case, you need to open the source file MP3 and from the options available in the program, choose ”Save as... FLA" or "Export to FLA".