If you are seeking a way to extract an swf from a windows Flash Projector executable there is a tool by Northcode I used way back. It's called exe2swf and can be downloaded from this support page:
http://www.northcode.com/blog.php/2007/08/02/Extract-SWF-files-from-Flash-Executables
Once you have your swf file there are several reverse engineering options to get back to a fla but only consider doing all this if this is your intellectual property and the original files were simply lost. One tool we used sucessfully on a complex project with just that situation is Sothink SWF Decompiler.