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swf file for change

Webboy2008 asked
I just got a project to update .swf file. How can I make some changes...the original developer already disappeared and I have no idea what to do.

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Dave BaldwinFixer of Problems
Most Valuable Expert 2014

You need the *.fla that the swf was created from.  An swf is essentially a compiled version and the fla is the source and editable version.  I don't know if you can update the swf itself.  A Google search  brings up some possiblities: http://www.google.com/search?q=swf+decompiler
Most Valuable Expert 2011
Top Expert 2016
Questions like this always make me smile.  It's a little like saying, "I've got to write some German poetry.  Someone gave me a German dictionary.  Now what?"  If you've never updated a .swf file before, the first thing you want to do is lower everyone's expectations for success.  Tell them that it may be impossible and may need to be recreated from nothing, at a great cost in time and money.  Suggest that they consider suing the original developer.  None of that helps advance the project, but at least it will buy time so you can go looking for the component parts of the original inputs to the SWF.  And maybe people will not be so angry if the project doesn't work out.  The kind of background and education needed for this sort of task would include a degree in psychology and a few years experience working with online animation.

A Google search for "fla and swf files" locates these sites that appear to be good learning resources.
http://www.eltima.com/products/flashdecompiler/ (never used that thing)
http://www.swf-to-fla.net/swf-editor/ (offers a free download)
http://en.wikipedia.org/wiki/Adobe_Flash_Professional (you may find you need this)

Consider also refactoring the animation into HTML5.  That is probably what a professional would recommend.  And good luck! ~Ray