As far as I know, Flash has to pass info off to another external process in order to save files – POSTing to PHP or talking to an executable, right? But every once in a while I hear rumors that Flash is able to open a file, make changes, then save/write those changes, all on its own – is it possible?
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This will be available in Flash Player 10:
Reading and Writing Local Files in Flash Player 10
http://www.mikechambers.com/blog/2008/08/20/reading-and-writing-local-files-in-flash-player-10/
Otherwise you need to use Adobe AIR, or bounce it off the server.
mike chambers
mesh@adobe.com