The .fla format is the Macromedia Flash source document for the .swf files. You will need this file if you intend to make changes to your Macromedia Flash presentation (the swf files). This can be used with any machine that has the commercial Macromedia Flash editor which is currently available for Microsoft Windows and Macintosh. Our themes require the latest version of Macromedia Flash editor if you wish to edit your .fla source. You can obtain this software from Macromedia.