Convert old .SFW File to version 9 of Flash

Convert an old .sfw file to the newest version of flash. The file is part of the home page of my website and it can be viewed fine in Internet Explorer.? The issue is that when we open Firefox, it doesn't work. We suspect that since the .swf was created in 2005, that Firefox is not able to understand the code. We want the file to be able to be viewed in FireFox and in Internet Explorer. The Code in the .SWF file calls an external .txt file that contains the path of the? .jpg pictures to be played in the Flash Movie. ** I do not have the .FLA File, only the .SWF **