As was introduced in Flash CS5, Flash Pro CC continues to support XFL file format, both as a compressed .fla and the uncompressed .xfl file types. Flash Pro also continues to support opening of files last saved in any, earlier version of Flash Professional. Supported file types include opening not only the XFL files saved in Flash CS5.5, and CS6, but also the older “binary” .fla files saved in Flash CS4 and earlier.
When saving a file, Flash Pro CC continues to provide the options of saving to a Flash document (.fla) or uncompressed document (.xfl). The resulting XFL file is internally stamped with the Flash Professional CC file version. However, since Flash CS5.5 and later releases are able to open “future” versions of XFL files, Flash CS5.5 and Flash CS6 can both also open Flash CC files. Consequently, you will not see options in the Save As Type drop-down list to explicitly save to an older version of Flash.