SD2 format files are Mac specific and contain resource forks, sometimes these resource forks get stripped off or corrupted, Usually when transferring to/from other platforms like PCs or after e-mailing/FTPing files.
SD2 fixer will delete any resource forks it finds and remove them, then it goes back through and places fresh new resource forks on the files with the parameters you specify, whether there was one there or not.
It will process one file at a time or a whole folder.
