you'd have to reverse-engineer the shockwave (or adobe) flash-files...since they don't provide the base files, which is understandable.
Not sure about the legality of doing so ^^
Freeware-tools just can extract ressource-files (ie audio, movie etc), but if you want to change the interface, you 'd need either a paid program (read: usually _very_ costly) or the source...
I just hit that brick-wall now with my 4-Player mod. I am amazed I managed to get so far though, which goes to show a combination of lstools and toolkit can prove successful.
