Someone posted a comment about decompiling .swcs, external class files and .mxml files.
I haven't tried the app but I'm going to say that no, it probably won't recreate your .as class files, due to the fact that when a swf gets compiled as2 code is compiled to down to as1 code. Youcan probably get at the code, but you may have to dig a little bit.
As far as .mxml files, those are converted to thier respective Actionscript classes when compiled, and it doesn't look like this product supports AS 3 yet.