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I am searching for a good, and preferably free, SWF editor and/or decompiler. I do not have access to the original FLAs.

Does anyone know of a program that would accomplish this?

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Nope, not outside of Adobe's powerhouse, and that's expensive. – Thomas Ward Jun 14 '12 at 17:50
:S Why hasn't anyone reversed-engineered that proprietary format yet? It would seem that I'm not the only one who's looking for this.. – SirCharlo Jun 14 '12 at 17:53
Decompilers exist. Answer incoming after I check my notes :) – Alistair Buxton Jun 14 '12 at 18:07
up vote 10 down vote accepted

You can decompile, edit, and recompile SWF using swfmill. This tool turns a SWF into XML and back again, e.g.:

swfmill swf2xml movie.swf movie.xml

swfmill xml2swf movie.xml movie.swf

However, whether this will be useful to you depends on how the SWF is put together. You can edit images, videos, audio etc within the movie using this method. They are present in the XML file as base64 encoded blocks which you can replace.

Editing text is much harder because text in SWF files is usually converted to curves so that the fonts do not need to be embedded.

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Thanks! That's actually really cool. I'm happily perusing through the SWF's exported XML now! :) – SirCharlo Jun 14 '12 at 19:11

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