Project files created by using previous version of StreamAuthor (1.x or 2.x) are unable to be opened in StreamAuthor (1.x or 2.x) once those files have been imported and converted by using StreamAuthor 3.x.

When an old project file is opened by StreamAuthor 3.x, file conversion will be required. Once StreamAuthor 3.x has converted the old project files, the converted files became inaccessible to StreamAuthor 1.x or 2.x.