JavaScript to Flash and Back?

Question

I am completely new to flash. We need to load a binary file from the user system (must work in Flash 9) and do some process in flash and save it back to the file system. I think that this would have to be done by getting the file in JavaScript and then encoding it send it to Flash.

Answer 1

http://weblogs.macromedia.com/flashjavascript/
http://kb2.adobe.com/cps/156/tn_15683.html

Those are two good links reguarding javascript communications

Answer 2

Local file system access is in Flash 10 with the File Reference enhancements. You're out of luck if targetting Flash 9.

Javascript cannot access the local filesystem either.

Answer 3

alternatively, you can make a JavaScript Flash file and make a window SWF, which has full file access. However, this could never be used on the web